Hyperthyroidism (overactive thyroid) is a condition in which your thyroid gland produces too much of the hormone thyroxine. Hyperthyroidism can significantly accelerate your body's metabolism, causing sudden weight loss, a rapid or irregular heartbeat, sweating, and nervousness or irritability.

• Sudden weight loss, even when your appetite and diet remain normal or even increase
• Rapid heartbeat (tachycardia) — commonly more than 100 beats a minute — irregular heartbeat (arrhythmia) or pounding of your heart (palpitations)
• Increased appetite
• Nervousness, anxiety and irritability
• Tremor — usually a fine trembling in your hands and fingers
• Sweating
• Changes in menstrual patterns
• Increased sensitivity to heat
• Changes in bowel patterns, especially more frequent bowel movements
• An enlarged thyroid gland (goiter), which may appear as a swelling at the base of your neck
• Fatigue, muscle weakness
• Difficulty sleeping

Description: Critical to your metabolism, thyroid function affects your energy level, heart rate, weight control, plus more.

This comprehensive evaluation of your thyroid hormone levels includes:

T-3 Uptake
Total T4
FTI
TSH
Total T3
Free T3
Free T4

..and more hormonal, immunological, and oxidative stress testing may be required.

Hypothyroidismis when the thyroid is underactive. Hypothyroidism (underactive thyroid) is a condition in which your thyroid gland doesn't produce enough of certain important hormones.

• Fatigue
• Sluggishness
• Increased sensitivity to cold
• Constipation
• Pale, dry skin
• A puffy face
• Hoarse voice
• An elevated blood cholesterol level
• Unexplained weight gain
• Muscle aches, tenderness and stiffness
• Pain, stiffness or swelling in your joints
• Muscle weakness
• Heavier than normal menstrual periods
• Brittle fingernails and hair
• Depression