Complications of thyroid problems
2-minute read
If you have a thyroid problem that is not treated properly, serious health complications can result.
An overactive thyroid (hyperthyroidism) can lead to a number of problems including:
- eye problems, such as bulging eyes, blurred or double vision or even vision loss
- heart problems, such as rapid heart rate, problems with heart rhythm or heart failure — these problems can usually be treated
- brittle bones (osteoporosis)
- red, swollen skin — occurring particularly on the shins and feet
- thyrotoxic crisis, which is a worsening of symptoms causing fever, rapid heart rate and delirium — this requires urgent medical attention
An underactive thyroid (hypothyroidism) can cause a range of complications, including:
- an enlarged thyroid, or goitre, which may cause problems with swallowing and breathing
- high cholesterol and associated heart disease
- nerve damage causing tingling, numbness and pain in the legs, arms or other affected areas
- infertility
- birth defects
- miscarriage or premature birth
- mental health issues such as depression
- myxedema, which is a rare, life-threatening condition involving intense cold intolerance, lethargy and drowsiness that can lead to unconsciousness. Myxedema requires urgent medical attention
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Last reviewed: November 2020
