There are 2 main disorders related to the thyroid gland: One is Hypothyroidism, when your thyroid gland doesn’t produce enough thyroid hormone. This is often linked to an iodine deficiency.
Symptoms include:
Cold Sensitivity
Hair loss, including eyebrows
Rough skin, dry, tangled hair
Lethargy
Weight Gain
Constipation
Hypoglycemia
Memory Loss
Also related to hypothyroidism that are seemingly unrelated to this condition include:
Fallen arches
Asthma
Psoriasis
Neck Pain and Stiffness
Carpal tunnel syndrome
Hoarseness
Pale Skin and Vertigo
The second disorder is overactive thyroid, or hyperthyroidism, often called Graves Disease. Its symptoms are opposites of those caused by underactive thyroid.
They include:
Restlessness and irritability
Weight loss
Brain Fog
Frequent Bowel Movements
Irregular Heartbeat
Protruding Eyes
 
Best overall product we recommend for thyroid balance:
Ortho Molecular Thyrotain
Lab tests to determine if your thyroid is functioning properly: