Itching of the skin – the need to comb the skin, can be a sign of various diseases.
The need to constantly scratch the body leads to microtrauma of the skin epithelium, which can be complicated by pustular diseases, as a result of infection entering the wounds. In addition, constant itching causes nervous exhaustion, leads to nervousness, emotional lability.
The cause of itching remains a stumbling block for many scientists. Previously it was thought that itching is a sensation that, when exacerbated, turns into pain: perceived by the same receptors in the skin, transmitted to the central nervous system along the same nerve fibers.
However, this theory is now disputed, saying that itching is a separate feeling, along with a feeling of pressure, cold, heat, and so on.
Itching of the skin occurs when exposed to nerve receptors of various stimuli: external and internal.
Sweat, cosmetics, various chemicals act on the surface of the skin, causing irritation of the itch receptors in the skin. Depending on the site of application of the irritant, itching can be localized on the face, in the perineum, armpits, and more.
Internal itching occurs under the action of endogenous irritants: biologically active substances, hormones, toxins that enter the blood during various diseases, metabolic products, food allergens, drugs.
The most common cause is allergies. Allergies can be caused by foods, household chemicals, synthetic clothing, and more. With allergic processes in the body, the amount of histamine increases, which causes itching.
With excessive exposure to ultraviolet radiation Histamine is also produced in the skin, so with prolonged exposure to the sun, the skin begins to itch.
Various skin diseases such as dermatitis, seborrhea, scabies, fungal infections, psoriasis, eczema, urticaria often cause itching.
If the rules of personal hygiene are not observed itching develops from the contact of secretions with the skin. It can be sweat, discharge from the urinary tract, etc.
Read more: When is itching a sign of illness?
Itching is a symptom of many diseases:
Diseases of the liver and gallbladder. An increase in bilirubin in the blood often leads to itching of the skin.
kidney failurewhen the body accumulates toxic metabolic products that are not completely excreted by the kidneys in the urine.
DiabetesThe higher the blood glucose level, the more pronounced itching.
Skin itching can occur with the pathology of the thyroid gland, with menopause, be a symptom of malignant neoplasms, blood diseases and helminthic invasion.
Separately allocate psychogenic itching and itching in diseases of the nervous system.
Constant itching requires a serious medical diagnosis. If the cause of the disease is established, etiotropic treatment is carried out: in diabetes mellitus, they lower the level of glucose in the blood, in diseases of the liver and gallbladder, they fight increased bilirubin in the blood, and in case of helminthic invasions, they take antihelminthic drugs.
Antihistamines, which are often used as anti-allergic drugs, help reduce itching.
Itching sensations can relieve the essential oils of peppermint and clove.