After sweating with crystals, it may be a normal physiological phenomenon, or it may be caused by diseases, such as diabetes, hyperthyroidism and so on. 1. Physiological phenomenon: sweat not only water, there are some other solid components, such as calcium lactate, magnesium, potassium, etc., when the body sweats a lot or eat a lot of greasy food, the excretion of solid components will be more, after the evaporation of water, the solid material will solidify, the formation of salt crystals. 2. Diabetes: Increased blood sugar will lead to a chronic increase in the body’s metabolism, there will be three more and one less symptom, that is, eat more, urinate more, drink more water, while weight loss, the skin metabolism in this case will also be increased, the emergence of salt crystals. 3. Hyperthyroidism: Hyperthyroidism not only accelerates the body’s metabolism, but also may lead to hyperhidrosis, a large amount of sweat and a large amount of excretion will cause salt crystals. If the body is accompanied by abnormal symptoms, it is necessary to consult a doctor as soon as possible, to carry out differential diagnosis, to clarify the cause of the disease and then correctly treated, do not delay the condition.