Could My Thyroid Medication Be Making Me Sick?

Hypersensitivity reactions to inactive ingredients have occurred in patients treated with thyroid hormone products. These include urticaria, pruritus, skin rash, flushing, angioedema, various gastrointestinal symptoms (abdominal pain, nausea, vomiting and diarrhea), fever, arthralgia, serum sickness, and wheezing.

What are the most common side effects of levothyroxine?

Levothyroxine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
  • weight gain or loss.
  • headache.
  • vomiting.
  • diarrhea.
  • changes in appetite.
  • fever.
  • changes in menstrual cycle.
  • sensitivity to heat.

What are the side effects of too much thyroid medication?

Getting too much thyroid hormone may cause symptoms that mimic having an overactive thyroid (hyperthyroidism).
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You could experience:
  • Heart palpitations or a faster heart rate, even at rest.
  • Trouble falling asleep.
  • Feeling jittery.
  • Sweating a lot.
  • Anxiety.
  • Shaky hands.
  • Diarrhea.
  • Weight loss.
Sarah Jenkins

Sarah Jenkins

Senior Technology Editor & AI Specialist

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.