worst-case scenario it can lead to osteoporosis. its shortage can also cause tooth decay and hair loss. black bile also stimulates appetite when the stomach is empty. excessive black bile symptoms darkening of the skin, developing brown skin patches, wrinkles, having dull skin, developing dark circles under your eyes, suffering muscle cramps (specially muscles of the posterior leg and toes during sleep), more painful menstrual cramps, irregular menstrual cycle, having depressing and negative thoughts, poor sleep, having nightmares, darker waste materials (sweat, urine), constipation, fake hunger, thicker and darker blood, having excessive unwanted hair, getting thinner, developing mental disorder such as depression, obsession, isolation, skepticism, and cynicism are symptoms of built up excessive or abnormal black bile in the body. phlegm after the humor of blood, phlegm is the second most abundant humor in the body. it has a cold and wet mizaj. phlegm is a slimy liquid very much like water (colorless, odorless and tasteless) and it can be found in body parts such as the dermis, adipose tissue (body fat), synovial fluid, and the mucus lining the lungs, throat, mouth, and nose, which require humidity and flexibility to function properly. the cerebrospinal fluid in the brain and spinal cord is also made up of phlegm. maintaining or improving flexibility is owed to the humor of phlegm. excessive phlegm symptoms feeling heavy, especially the eyelids and the head, getting puffy and swollen, feeling cold (in contrast with people with sanguine temperament), breaking into cold sweat, getting sweaty palms, getting pale, not feeling thirsty or feeling false thirst, increased mucus production (getting runny nose or watery eyes), stringy or thick saliva, weakness, weakened muscle, sagging of skin, sleepiness, having trouble waking up especially in damp places or cities with high humidity and during cold seasons, memory loss, dizziness, difficulty learning or remembering something, having difficulty digesting food, bloating, frequent urination, sour burp, and diarrhea are the symptoms of excessive phlegm in the body. joint making cracking sounds can be a symptom of lack of phlegm. joints, and respiratory and digestive tracts function healthily with sufficient amounts of phlegm. iranian traditional medicine and eye health the recommendations of itm for preventing eye diseases can be classified with respect to the mechanism associated with the negative effects on eyes: some of the factors may directly cause dry eye, including gazing in a fire for a long time, too much crying, or gazing at bright objects. however, some factors may cause dry eye following body dehydration. those factors include edible substances such as salty and hot foods, insufficient sleep, too much sexual activity, and too much perspiration. factors that cause emtela including lack of physical activity, insufficient exercise, incomplete digestion of food, overeating, or eating foods before digestion of the previous meal can cause accumulation of wastes in the eyes and may result in eye fatigue. concentrating factors: oversleeping or eating beef can cause concentration of moisture inside the body. those factors slow down blood flow inside the eye tissue followed by poor vision. factors that may cause flatulence and gas including peas, beans, vegetables and horseradish, and drinking cold water with foods cause excessive vapor inside the body, including eye tissues, and impair the natural functions of the eye.