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Some symptoms of protein deficiency include constant cravings for carbohydrates, sweets, caffeine, chips and other processed, high-sugar or refined foods; muscle or joint pain, which is caused by a lack of protein reserv... More »

The normal total protein level in blood is 6 to 8.3 grams per deciliter, according to MedlinePlus. Blood protein levels may be higher during pregnancy. More »

Monoclonal proteins, or M proteins, are produced by a variety of white blood cells called plasma cells, explains Mayo Clinic. The condition known as monoclonal gammopathy of undetermined significance, or MGUS, refers to ... More »

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Physical symptoms of serotonin deficiency include persistent fatigue, sleep disorders, loss of appetite combined with a craving for carbohydrates, headaches and a fluctuating body temperature, according to Progressive He... More »

Women with a vitamin D deficiency may experience issues such as depression, reduced tolerance to pain, fatigue and increased moodiness, according to Women's Health magazine. Female athletes have reported muscle weakness ... More »

According to Mayo Clinic, common causes of insomnia are stress, anxiety, depression, medical conditions, change in environment or work schedule, poor sleep habits, medications, caffeine and eating too late in the evening... More »

Symptoms of Addison's disease include fatigue, muscle weakness, joint pain, darkening of the skin, salt cravings, weight loss and decreased appetite, as listed by Mayo Clinic. Sufferers may also experience low blood suga... More »