皮肤经常莫名其妙发痒皮肤太干或者神经纤维受到刺激都会带给人痒的感觉。因为神经末梢对炎症和周围的环境尤其是气温的改变特别敏感,容易有发痒的感觉。紧张的时候手出汗当我们承受很大的压力时,身体会通过分泌汗液来排解紧张情绪,由于汗腺所在部位不同,其对于感觉和心理刺激及对于热的刺激的反应也有所不同。在紧张、恐惧、兴奋等精神因素影响下神经冲动从大脑皮质传递到手掌小汗腺部导致小汗腺的分泌排泄活动在短期内迅速增强即产生手掌神经性出汗。这种出汗一般出现在手心部位有时也会出现在手背、头面、颈部、前臂和小腿等处。蹲后站立会头晕眼花当你蹲着的时候血液都集中在下半身而猛地站起来的时候头 Skin often baffling itchy skin too dry or nerve fibers are stimulated will give itchy feeling. Because nerve endings are particularly sensitive to inflammation and changes in the surrounding environment, especially temperature, it is easy to have an itchy feeling. Sweaty hands Sweaty When we are under a lot of stress, the body dissipates sweat to relieve tension. The sweat glands vary in response to sensory and psychological stimuli and to thermal stimuli. In the nervous, fear, excitement and other mental factors under the influence of nerve impulses from the cerebral cortex to the palm of the small sweat gland leading to excretion of excretion of sweat glands in the short term rapid increase that produces palmar neuropathic sweating. This kind of sweating usually appears in the palm of the hand may sometimes appear in the back of the hand, head, neck, forearm and lower leg and so on. Standing squatting dizzy when you are squatting when the blood is concentrated in the lower body and suddenly stood up