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What are the symptoms of being overmedicated with thyroid medicine?

Author

Daniel Rodriguez

Published Feb 17, 2026

What are the symptoms of being overmedicated with thyroid medicine?

Signs and Symptoms of Overmedication

  • Elevated pulse and blood pressure.
  • Anxiety, nervous energy, tremors.
  • Feeling irritable, overemotional, erratic, or depressed.
  • Difficulty concentrating.
  • Difficulty sleeping.
  • Fatigue.
  • Feeling overheated, even when others are cold.
  • Diarrhea.

What are the symptoms of thyroid hormone overdose?

Symptoms of poisoning with this type of medicine include:

  • Changes in menstrual pattern.
  • Chest pain.
  • Confusion.
  • Convulsions (seizures)
  • Dilated pupils.
  • Diarrhea.
  • Excessive sweating, skin flushing.
  • Fever.

How do you know if your thyroid medication needs adjusting?

In general, the most indicators that your doctor needs to adjust your levothyroxine dose is that you start having signs and symptoms of an overactive thyroid. These include: Racing or irregular heartbeat or palpitations. Increased blood pressure.

What happens when your thyroid medication is too high?

Too much thyroid medication in hypothyroidism can cause health problems and trigger symptoms like the jitters, anxiety, weight loss, diarrhea and mood swings. Your thyroid hormone needs may change over time.

How do I know if I’m taking too much levothyroxine?

Overdose symptoms may include headache, leg cramps, tremors, feeling nervous or irritable, chest pain, shortness of breath, and fast or pounding heartbeats.

What does a thyroid storm feel like?

Symptoms of thyroid storm include: Feeling extremely irritable or grumpy. High systolic blood pressure, low diastolic blood pressure, and fast heartbeat. Nausea, vomiting, or diarrhea.

What happens if I took too much levothyroxine?

What happens if I overdose on Levothyroxine (Synthroid)? Overdose symptoms may include headache, leg cramps, tremors, feeling nervous or irritable, chest pain, shortness of breath, and fast or pounding heartbeats.

What are the side effects of too much levothyroxine?

What happens when there is too much thyroxine in the body?

Having too little thyroxine or too much thyroxine can cause health problems. If your body releases too much thyroxine, you will suffer a condition called thyrotoxicosis. This can cause a goiter, which is a swelling of the neck because of an enlarged thyroid gland.

What is a thyroid flare up?

Flares happen because there’s additional stress on your body, which taxes an immune system that already acts unnaturally hypervigilant, sending it into a tailspin. “When flares happen, there is a greater antibody response going on at that time, which leads to more destruction of the thyroid gland,” says Dr. Sharma.