My arm goes numb as soon as I sit down.

Numbness in the arm upon sitting down may be caused by physiological factors, or by pathological conditions such as neuritis or cervical spondylosis. Treatment should be targeted according to the specific cause. Detailed analysis is as follows:

I. Physiological Factors

If one sits and leans over a table while sleeping, prolonged sitting can compress the arms, impairing blood circulation and easily causing numbness. This is considered a normal physiological phenomenon, and symptoms typically resolve once the triggering factor is removed.

II. Pathological Factors

1. Neuritis

Neuritis is an inflammatory lesion of nerves caused by various factors. Under inflammatory stimulation, patients may experience arm numbness. Symptoms can be alleviated with medications such as vitamin B1 tablets or mecobalamin tablets, taken under medical supervision.

2. Cervical Spondylosis

Cervical spondylosis is a clinical syndrome caused by degenerative changes in the cervical intervertebral discs. After developing this condition, maintaining a forward-bent head posture for long periods while sitting can easily lead to structural abnormalities in the cervical spine. Compression of surrounding nerve roots may then result in arm numbness. Relief may be achieved through massage or traction therapy.

In addition to the above relatively common causes, other conditions such as diabetes, brain tumors, or encephalitis may also be responsible. If discomfort occurs, prompt medical evaluation and timely treatment are essential to avoid disease progression.