A Case of Thyrotoxic Periodic Paralysis: "I Can't Move!"
Open accessAbstract
Thyrotoxic periodic paralysis (TPP) is a form of hypokalemic periodic paralysis associated with hyperthyroidism. It is characterized by hypokalemia associated with acute proximal symmetrical lower limb weakness and can progress to involve all four limbs and the respiratory musculature. We present a case of a 27-year-old Asian male with recurrent attacks of weakness in all four extremities. A subsequent diagnosis of thyrotoxic periodic paralysis was made, which was secondary to a previously undiagnosed Grave's disease. TPP should be a differential in a young male of Asian ethnicity who presents to the hospital with acute onset of paralysis.
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Written from the paper’s full text.
TL;DR
A 27-year-old Asian male presented with acute quadriparesis and dyspnea, severe hypokalemia, and previously undiagnosed Graves’ disease, leading to a diagnosis of thyrotoxic periodic paralysis. His symptoms improved rapidly after electrolyte replacement and propranolol, and he was discharged on methimazole and propranolol with endocrinology follow-up.
Key findings
- The patient had power of 0/5 in bilateral upper and lower extremities, no sensory deficits, and an ECG QTc of 503 ms.
- Laboratory values included potassium 1.3 mmol/L (reference 3.4–4.8), magnesium 1.5 mg/dL (1.6–2.2), phosphorus 1.5 mg/dL (2.2–5.5), TSH <0.01 mIU/ml (0.5–5.0), free T4 4.27 ng/dL (0.58–1.64), free T3 14.09 ng/dL (2.53–3.87), thyroid-stimulating immunoglobulin 4.14 IU/L (0.00–0.55), and thyroid peroxidase antibody 240 mIU/ml (<34.9).
- A provisional diagnosis of thyrotoxic periodic paralysis was made; thyroid-stimulating immunoglobulin and thyroid peroxidase antibody elevations confirmed a new diagnosis of Graves’ disease.
- Symptoms improved rapidly within hours after electrolyte replacement and propranolol; the patient was discharged on methimazole and propranolol with endocrinology follow-up.
Methods
- Single case report of a 27-year-old Asian male with recurrent attacks of weakness, prior episodes precipitated by drinking beer and physical exertion, who presented with inability to move his upper and lower extremities upon awakening and difficulty breathing.
- Evaluation included vital signs, neurological examination, ECG, laboratory studies (electrolytes, thyroid function tests, thyroid antibodies, creatine phosphokinase, arterial blood gas), and thyroid ultrasound.
- Management consisted of admission to the medical intensive care unit for aggressive electrolyte repletion, intravenous propranolol, and methimazole; no formal study design or statistical analysis is reported.
Limitations
- Not stated in the paper: the report does not include a limitations section.
- Evident from the text: this is a single case report without a comparison group, so findings are not generalizable.
- Evident from the text: no long-term follow-up outcomes after discharge are reported, and no genetic testing for periodic paralysis is described.
Model-written summary. Check it against the paper before relying on it.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
0 of 13 cited sources checked · 0 supported · 0 flagged
- Findingown data
The patient had hypophosphatemia, with a phosphorus level of 1.5 mg/dL.
“| Phosphorus (mg/dL) | 1.5 | 2.2-5.5 |”
Quote in the paperSubstantial claim - Findingown data
The patient had hypomagnesemia, with a magnesium level of 1.5 mg/dL.
“| Magnesium (mg/dL) | 1.5 | 1.6-2.2 |”
Quote in the paperNot a substantial claim - Findingown data
The patient had elevated thyroid-stimulating immunoglobulin.
“| Thyroid-stimulating immunoglobulin (IU/L) | 4.14 | 0.00-0.55 |”
Quote in the paperNot a substantial claim - Findingown data
Ultrasound of the thyroid showed enlarged right and left lobes.
“Ultrasound of the thyroid revealed enlarged right and left lobes of the thyroid gland, bilateral sub-centimeter thyroid nodules, and diffuse increased vascular flow throughout the thyroid gland (Figure 2,3).”
Quote in the paperNot a substantial claim - Findingown data
Neurological examination showed power of 0/5 in bilateral upper and lower extremities.
“Neurological examination was remarkable for power of 0/5 in bilateral upper and lower extremities.”
Quote in the paperSubstantial claim
- Findingown data
The patient had hypokalemia, with a potassium level of 1.3 mmol/L.
“| Potassium (mmol/L) | 1.3 | 3.4-4.8 |”
Quote in the paperSubstantial claim - Findingown data
Ultrasound of the thyroid showed diffuse increased vascular flow throughout the gland.
“Ultrasound of the thyroid revealed enlarged right and left lobes of the thyroid gland, bilateral sub-centimeter thyroid nodules, and diffuse increased vascular flow throughout the thyroid gland (Figure 2,3).”
Quote in the paperNot a substantial claim - Findingown data
Electrocardiogram showed a prolonged QTc interval of 503 ms.
“Electrocardiogram showed a prolonged QTc interval of 503 ms (Figure 1).”
Quote in the paperNot a substantial claim - Findingown data
The patient had similar past episodes of sudden onset weakness with inability to move his arms and legs that resolved spontaneously.
“The patient had similar episodes in the past when he developed sudden onset weakness with the inability to move his arms and legs with spontaneous resolution.”
Quote in the paperNot a substantial claim - Findingown data
The patient's symptoms improved rapidly within hours of therapy following electrolyte replacement and propranolol.
“His symptoms improved rapidly within hours of therapy following electrolyte replacement and propranolol.”
Quote in the paperNot a substantial claim - Premisecitation
Recent studies support that genetic loss-of-function mutations in inward rectifying potassium channels are associated with TPP.
“Recent studies have supported the genetic loss of function mutations in inward rectifying potassium channels associated with TPP.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [8] Lin SH, Huang CL. Mechanism of thyrotoxic periodic paralysis. J Am Soc Nephrol. 2012, 23:985-8. 10.1681/ASN.2012010046 source
Not checked in the free run.
- Interpretationown data
A diagnosis of thyrotoxic periodic paralysis was made in a 27-year-old Asian male, secondary to previously undiagnosed Graves' disease.
“A subsequent diagnosis of thyrotoxic periodic paralysis was made, which was secondary to a previously undiagnosed Grave’s disease.”
Quote in the paperSubstantial claim- Rests on an assumption: TPP is a form of hypokalemic periodic paralysis associated with hyperthyroidism.
- Rests on an assumption: TPP is characterized by hypokalemia associated with acute proximal symmetrical lower limb weakness and can progress to involve all four limbs and the respiratory musculature.
- Premisecitation
Unlike familial hypokalemic periodic paralysis, TPP can only happen during a hyperthyroid state.
“Unlike familial hypokalemic periodic paralysis, TPP can only happen during a hyperthyroid state [7].”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [7] Fialho D, Griggs RC, Matthews E. Periodic paralysis. Handb Clin Neurol. 2018, 148:505-20. 10.1016/B978-0-444-64076-5.00032-6 source
Not checked in the free run.
- Interpretationown data
TPP is a reversible and controllable complication of thyrotoxicosis once diagnosed.
“TPP is a reversible and controllable complication of thyrotoxicosis once diagnosed.”
Quote in the paperSubstantial claim - Interpretationown data
The patient with no history of hyperthyroidism presented weakness of the upper and lower extremities, which are uncommon presentations of TPP.
“Our patient with no history of hyperthyroidism presented weakness of the upper and lower extremity, which are uncommon presentations of TPP.”
Quote in the paperSubstantial claim - Premisecitation
Potassium supplementation has no proven benefits in preventing future TPP events.
“Potassium supplementation has no proven benefits in preventing future TPP events [9].”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [9] Lam L, Nair RJ, Tingle L. Thyrotoxic periodic paralysis. Proc (Bayl Univ Med Cent). 2006, 19:126-9. 10.1080/08998280.2006.11928143 source
Not checked in the free run.
- May combine two claims. 6
- Classified as probably not a substantial claim. 9
May combine two claims.
Findingown dataThe patient at presentation had abnormal TSH, FT4, and FT3 but did not have any thyrotoxic symptoms, and his vitals were stable.
“Our patient at presentation had abnormal TSH, FT4, and FT3; however, he did not have any thyrotoxic symptoms, and his vitals were stable.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataA 27-year-old Asian male with no known co-morbidities presented with an inability to move his upper and lower extremities since awakening and difficulty breathing.
“A 27-year-old Asian male with no known co-morbidities presented to the hospital because of an inability to move his upper and lower extremities since awakening from sleep in the morning and was accompanied by difficulty breathing.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataUltrasound of the thyroid showed bilateral sub-centimeter thyroid nodules.
“Ultrasound of the thyroid revealed enlarged right and left lobes of the thyroid gland, bilateral sub-centimeter thyroid nodules, and diffuse increased vascular flow throughout the thyroid gland (Figure 2,3).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataThe patient's prior attacks were precipitated by drinking beer and physical exertion.
“Prior attacks were precipitated by drinking beer and physical exertion.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataThe patient had elevated thyroid peroxidase antibody.
“| Thyroid peroxidase antibody (mIU/ml) | 240 | <34.9 |”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe patient had low TSH, high serum-free T4, and elevated serum-free T3.
“Other significant findings included low TSH, high serum-free T4, and elevated serum-free T3.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationThyrotoxic periodic paralysis is characterized by a thyroid hormone-induced intracellular shift of potassium, leading to muscle weakness and paralysis.
“Thyrotoxic periodic paralysis is characterized by a thyroid hormone-induced intracellular shift of potassium, leading to muscle weakness and paralysis.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [8] Lin SH, Huang CL. Mechanism of thyrotoxic periodic paralysis. J Am Soc Nephrol. 2012, 23:985-8. 10.1681/ASN.2012010046 source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationThyrotoxic periodic paralysis occurs in males in ratios ranging from 17:1 to 70:1.
“TPP occurs in males in ratios ranging from 17:1 to 70:1 [2, 3].”
Quote in the paperNot a substantial claim0 of 2 sources checked- cites [2] Patel M, Ladak K. Thyrotoxic periodic paralysis: A case report and literature review. Clin Med Res. 2021, 19:148-51. 10.3121/cmr.2021.1610 source
Not checked in the free run.
- cites [3] Iqbal QZ, Niazi M, Zia Z, Sattar SB. A literature review on thyrotoxic periodic paralysis. Cureus. 2020, 12:e10108. 10.7759/cureus.10108 source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationThyrotoxic periodic paralysis is common in East Asian populations, with an incidence of approximately 2%.
“TPP is common in East Asian populations, with an incidence of approximately 2% [1].”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [1] Siddamreddy S, Dandu VH. Thyrotoxic Periodic Paralysis. StatPearls Publishing, Treasure Island, FL; 2022.
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationThyrotoxic periodic paralysis typically affects Asian males between the ages of 20 and 40.
“It typically affects Asian males between the ages of 20-40 [4, 5, 6].”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites [4] Chang CC, Cheng CJ, Sung CC, Chiueh TS, Lee CH, Chau T, Lin SH. A 10-year analysis of thyrotoxic periodic paralysis in 135 patients: focus on symptomatology and precipitants. Eur J Endocrinol. 2013, 169:529-36. 10.1530/EJE-13-0381 source
Not checked in the free run.
- cites [5] Ko GT, Chow CC, Yeung VT, Chan HH, Li JK, Cockram CS. Thyrotoxic periodic paralysis in a Chinese population. QJM. 1996, 89:463-8. 10.1093/qjmed/89.6.463 source
Not checked in the free run.
- cites [6] Kung AW. Clinical review: thyrotoxic periodic paralysis: a diagnostic challenge. J Clin Endocrinol Metab. 2006, 91:2490-5. 10.1210/jc.2006-0356 source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationOne study showed that 65% of TPP patients had initial thyrotoxic symptoms and 60% were clinically thyrotoxic at presentation.
“One study showed that 65% of TPP patients had initial thyrotoxic symptoms and 60% were clinically thyrotoxic at presentation [5].”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [5] Ko GT, Chow CC, Yeung VT, Chan HH, Li JK, Cockram CS. Thyrotoxic periodic paralysis in a Chinese population. QJM. 1996, 89:463-8. 10.1093/qjmed/89.6.463 source
Not checked in the free run.
May combine two claims.
PremisecitationIncreased Na-K ATPase activity, coupled with genetic mutations, can lead to a cycle of extreme hypokalemia in periodic paralysis.
“This, coupled with increased Na-K ATPase activity, can lead to a cycle of extreme hypokalemia, as seen in periodic paralysis [8].”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [8] Lin SH, Huang CL. Mechanism of thyrotoxic periodic paralysis. J Am Soc Nephrol. 2012, 23:985-8. 10.1681/ASN.2012010046 source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationA high glucose load, insulin infusion, and exercise test could induce paralysis and weakness during the post-exercise resting period.
“A high glucose load, insulin infusion, and exercise test could induce paralysis and weakness during the post-exercise resting period [6].”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [6] Kung AW. Clinical review: thyrotoxic periodic paralysis: a diagnostic challenge. J Clin Endocrinol Metab. 2006, 91:2490-5. 10.1210/jc.2006-0356 source
Not checked in the free run.
The paper relies on this without support.
TPP is a form of hypokalemic periodic paralysis associated with hyperthyroidism.
“Thyrotoxic periodic paralysis (TPP) is a form of hypokalemic periodic paralysis associated with hyperthyroidism.”
The paper relies on this without support.
TPP is characterized by hypokalemia associated with acute proximal symmetrical lower limb weakness and can progress to involve all four limbs and the respiratory musculature.
“It is characterized by hypokalemia associated with acute proximal symmetrical lower limb weakness and can progress to involve all four limbs and the respiratory musculature.”
The paper relies on this without support.
There is no change in total body potassium in TPP.
“Since there is no change in total body potassium, correction of the hypokalemia needs to be monitored to prevent rebound hyperkalemia.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Other electrolyte imbalances-hypophosphatemia, hypomagnesemia, and hypocalcemia-may occur in some patients with THPP, potentially due to transcellular electrolyte shifts, and often resolve spontaneously.
“Other electrolyte imbalances—such as hypophosphatemia, hypomagnesemia, and hypocalcemia—may occur in some patients with THPP, potentially due to transcellular electrolyte shifts [36]. These disturbances often resolve spontaneously [3].”
From Thyrotoxic Hypokalemic Periodic Paralysis: Pathophysiological Mechanisms (2025) · cites this paper as [3]
The Case presentation reports hypomagnesemia and hypophosphatemia in the patient with TPP. It does not report hypocalcemia, and the Discussion attributes an intracellular shift to potassium, not to the other electrolytes. The separate claim that the disturbances resolve spontaneously is cited to [3], not to this source. (LLM, conf=0.87)
Experimental — accuracy not yet measuredTHPP presents with acute intermittent flaccid paralysis that spontaneously resolves, in association with hypokalemia and biochemical hyperthyroidism.
“THPP presents with acute intermittent flaccid paralysis that spontaneously resolves, in association with hypokalemia and biochemical hyperthyroidism [3].”
From Thyrotoxic Hypokalemic Periodic Paralysis: Pathophysiological Mechanisms (2025) · cites this paper as [3]
Hypokalemia in THPP arises predominantly from intracellular redistribution of potassium rather than from true potassium loss via renal or gastrointestinal routes.
“Importantly, hypokalemia in THPP arises predominantly from intracellular redistribution of potassium rather than from true potassium loss via renal or gastrointestinal routes [3].”
From Thyrotoxic Hypokalemic Periodic Paralysis: Pathophysiological Mechanisms (2025) · cites this paper as [3]
THPP is a rare but potentially fatal complication of thyrotoxicosis characterized by transient episodes of muscle weakness with hypokalemia and underlying hyperthyroidism.
“Thyrotoxic hypokalemic periodic paralysis (THPP) is a rare but potentially fatal complication of thyrotoxicosis, characterized by transient episodes of muscle weakness in the setting of hypokalemia and underlying hyperthyroidism.”
From Thyrotoxic Hypokalemic Periodic Paralysis: Pathophysiological Mechanisms (2025) · cites this paper as [3]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Provisional diagnosis uses TTP instead of TPP
MinorThe case presentation calls the provisional diagnosis "TTP," while the paper identifies the patient's condition as thyrotoxic periodic paralysis, abbreviated "TPP."
“A provisional diagnosis of TTP was made”
“A subsequent diagnosis of thyrotoxic periodic paralysis was made, which was secondary to a previously undiagnosed Grave’s disease.”
Cites
Thyrotoxic Periodic Paralysis: A Diagnostic Challenge
Kung, A. W. C. (2006) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jc.2006-0356 · Cited by 371 · cited 2× · see citing works
“It typically affects Asian males between the ages of 20-40 [4, 5, 6].”
BackgroundMechanism of Thyrotoxic Periodic Paralysis
Lin, S.-H., & Huang, C.-L. (2012) · Journal of the American Society of Nephrology · doi:10.1681/asn.2012010046 · Cited by 174 · cited 1× · see citing works
“This, coupled with increased Na-K ATPase activity, can lead to a cycle of extreme hypokalemia, as seen in periodic paralysis [8].”
BackgroundThyrotoxic periodic paralysis in a Chinese population
Ko, G. T. C., Chow, C. C., Yeung, V. T. F., Chan, H. H. L., LI, J. K. Y., & Cockram, C. S. (1996) · QJM · doi:10.1093/qjmed/89.6.463 · Cited by 160 · cited 2× · see citing works
“It typically affects Asian males between the ages of 20-40 [4, 5, 6].”
BackgroundChang, C.-C., Cheng, C.-J., Sung, C.-C., Chiueh, T.-S., Lee, C.-H., Chau, T., & Lin, S.-H. (2013) · European Journal of Endocrinology · doi:10.1530/eje-13-0381 · Cited by 114 · cited 1× · see citing works
“It typically affects Asian males between the ages of 20-40 [4, 5, 6].”
BackgroundLam, L., Nair, R. J., & Tingle, L. (2006) · Baylor University Medical Center Proceedings · doi:10.1080/08998280.2006.11928143 · Cited by 76 · cited 2× · see citing works
“Potassium supplementation has no proven benefits in preventing future TPP events [9].”
Background(2018) · Handbook of clinical neurology · doi:10.1016/b978-0-444-64076-5.00032-6 · Cited by 61 · see citing works
A literature review on thyrotoxic periodic paralysis
Iqbal, Q. Z., Niazi, M., Zia, Z., & Sattar, S. B. A. (2020) · Cureus · doi:10.7759/cureus.10108 · Cited by 33 · cited 1× · see citing works
“Despite thyrotoxicosis affecting females nine times more than males, TPP occurs in males in ratios ranging from 17:1 to 70:1 [2, 3].”
BackgroundThyrotoxic periodic paralysis: A case report and literature review
Patel, M., & Ladak, K. (2021) · Clinical Medicine & Research · doi:10.3121/cmr.2021.1610 · Cited by 27 · cited 1× · see citing works
“Despite thyrotoxicosis affecting females nine times more than males, TPP occurs in males in ratios ranging from 17:1 to 70:1 [2, 3].”
BackgroundFralick, M., & Sarma, S. (2021) · New England Journal of Medicine · doi:10.1056/nejmicm2030770 · Cited by 6 · see citing works
Flagged first, then by citations
1 of the 10 references couldn’t be matched to a known paper.
Cited by
Sorted by citations
Thyrotoxic Hypokalemic Periodic Paralysis: Pathophysiological Mechanisms
Qing, G., Zakaria, W. N. A., Rom, F. Z. M., Nik, W. N. F. H. W., Zulkeflee, H. A., & Rahim, S. N. A. (2025) · Endocrinology and Metabolism · doi:10.3803/enm.2025.2554 · Cited by 5 · see citing works
“THPP presents with acute intermittent flaccid paralysis that spontaneously resolves, in association with hypokalemia and biochemical hyperthyroidism [3].”
InfluentialParálisis periódica tirotóxica, una serie de casos
Sánchez, J. L. B., Guerra, L. I. G., Martínez, I. A. P., Mesa, J. S. N., & Rodríguez, L. J. V. (2024) · Neurología Argentina · doi:10.1016/j.neuarg.2024.04.003 · Cited by 1 · see citing works
- Authors
- Basnet, A., Goyal, N., Tiwari, K., Kansakar, S., & Gautam, S.
- Affiliations
- Maimonides Medical Center (US)
- Corresponding author
- Basnet, Arjun
- ORCID
- Kansakar, Sajog
- Venue
- Cureus
- Published
- 2023-01-28
- Volume
- 15
- Issue
- 1
- Pages
- e34301-e34301
- ISSN
- 2168-8184 (ISSN-L)
- PMC
- PMC9969901
- OpenAlex
- W4318340515
- Semantic Scholar
- 2db04d99472e8afa411fe098e1413253b443f04f
- Cited by
- 2
- References
- 10
- Citations by year
- 2025: 1 · 2024: 1
- FWCI
- 0.41
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- cc-by
- Locations
- Cureus (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Potassium and Related Disorders
- Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
- Keywords
- thyrotoxic periodic paralysis, hypokalemic periodic paralysis, hyperthyroidism, Graves' disease, hypokalemia, proximal muscle weakness, respiratory muscle weakness, differential diagnosis, young male patient
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