When TSH is low, it usually means your thyroid is overactive. Recognizing low TSH symptoms early can help you get treatment before complications develop.
Common Physical Symptoms of Low TSH
- Unexplained weight loss
- Rapid heartbeat or palpitations
- Heat intolerance and excessive sweating
- Tremors in the hands
- Frequent bowel movements or diarrhea
- Muscle weakness
- Difficulty sleeping
Emotional and Cognitive Symptoms
- Anxiety and nervousness
- Irritability or mood swings
- Difficulty concentrating
- Restlessness
Eye and Skin Changes
In Graves' disease — a common cause of low TSH — you may notice bulging eyes, eye irritation, or vision changes. Your skin may become thin and smooth, and hair may become fine or brittle.
When to See a Doctor
Seek medical attention if you experience a resting heart rate over 100 beats per minute, chest pain, severe anxiety, or vision changes. A simple TSH blood test can confirm whether your thyroid is overactive.
Complete Thyroid Evaluation
If low TSH is suspected, your doctor may also order a full thyroid panel with Free T4, Free T3, and TSI antibodies to determine the cause and best treatment.
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