Hypothyroidism or underactive thyroid is a condition in which the thyroid glands do not produce enough of the thyroid hormone. Women above 60 years are more likely to suffer from this health condition.
Causes:

• Autoimmune diseases
• Thyroid surgery
• Radiation therapy
• Medication

Symptoms:

• Fatigue
• Weak muscles
• Pain or swelling in joints
• Thinning of hair
• Weight gain
• Depression
• Constipation
• Slow heart rate