What causes numbness and swelling in the right hand?

　　Under normal circumstances, numbness and swelling in the right hand may be caused by improper posture, cold exposure, Raynaud's phenomenon, carpal tunnel syndrome, cervical spondylosis, and other conditions. Symptomatic management such as general treatment and medication may be necessary. If discomfort persists, it is recommended to seek timely medical attention and undergo appropriate treatment under a physician's guidance. Detailed explanations are as follows:

　　1. Improper Posture

　　Maintaining the same posture for extended periods, such as prolonged computer use, mobile phone usage, or driving, may compress nerves, causing numbness and swelling in the right hand. In addition to numbness and swelling, symptoms such as hand weakness and reduced finger dexterity may also occur. It is recommended to adjust work and lifestyle habits, take regular breaks, change postures frequently, and perform appropriate hand stretching and relaxation exercises.

　　2. Cold Exposure

　　In cold environments, the body automatically constricts blood vessels in the limbs to maintain core body temperature, reducing blood flow to the hands and leading to poor local circulation and insufficient oxygen supply to nerves and muscles, which may result in numbness and aching sensations. The hands may also appear pale and feel cold. It is recommended to wear warm gloves and avoid prolonged exposure to cold environments.

　　3. Raynaud's Phenomenon

　　Raynaud's phenomenon is a vascular disorder primarily characterized by sudden whitening and bluing of the fingers or toes upon exposure to cold or emotional stress, followed by a return to redness. This occurs due to excessive response of small arteries to cold or emotional changes, causing vascular spasms and impaired circulation, which affects oxygen supply to the hands. It is recommended to follow medical advice in using medications such as nifedipine tablets, diltiazem hydrochloride injection, and captopril tablets to alleviate symptoms.

　　4. Carpal Tunnel Syndrome

　　The carpal tunnel contains the median nerve and multiple tendons. When pressure within the carpal tunnel increases, the median nerve can become compressed, leading to sensory abnormalities and circulatory disturbances in the hand. Symptoms may include hand weakness, pain, or burning sensations. It is recommended to follow medical advice when using medications such as ibuprofen tablets, mecobalamin tablets, and adenosylcobamide tablets for treatment.

　　5. Cervical Spondylosis

　　Cervical spondylosis is a condition based on degenerative pathological changes of the cervical intervertebral discs. Degenerative changes in the cervical discs can lead to cervical structural instability, thereby compressing nerve roots and affecting sensation and circulation in the hands. Symptoms may include neck pain, stiffness, dizziness, and other related symptoms. It is recommended to follow medical advice in using medications such as chlorzoxazone tablets, eperisone hydrochloride tablets, and naproxen sodium tablets to alleviate symptoms.

　　It is recommended to maintain proper posture during daily work and study, avoid slouching, and prevent pressure on the neck and shoulders that may affect upper limb nerves.