Schwannoma is a type of tumor that develops from Schwann cells, which are responsible for producing the myelin sheath that insulates nerves. These tumors are usually benign, meaning they are not cancerous, and can occur in various parts of the body, including the spinal cord, peripheral nerves, and cranial nerves. While many schwannomas do not cause symptoms, some can lead to pain, numbness, or weakness depending on their location and size. Diagnosis typically involves imaging tests like MRI or CT scans, and treatment may include monitoring or surgical removal if the tumor causes significant issues.