Fibromyalgia and hypothyroidism are conditions that can cause aches and pains all over the body, notes Mayo Clinic. Doctors believe that fibromyalgia is the result of problems with how the brain processes pain signals, while hypothyroidism occurs when the body does not produce hormones properly, causing an imbalance in the body's chemical reactions.
People with fibromyalgia experience widespread pain, and they may have other symptoms such as fatigue, trouble concentrating, headaches and depression, states Mayo Clinic. While doctors don't know the exact cause of fibromyalgia, they believe it to be a combination of genetic factors, infections and physical or emotional trauma. Women are more likely than men to develop fibromyalgia, as are those with diseases such as rheumatoid arthritis and those with relatives who have the condition.
Symptoms of hypothyroidism tend to develop slowly and become more apparent as patients' hormone deficiencies worsen, according to Mayo Clinic. In addition to muscle aches, tenderness and stiffness, people with hypothyroidism may experience pain or stiffness in their joints, muscle weakness, fatigue and an increased sensitivity to cold. Women over the age of 60, people with family histories of thyroid diseases, those with autoimmune diseases and women who have been pregnant or had a baby in the last six months are at higher risk of developing hypothyroidism.