Sudden pain in the top of the head when touched can have a variety of causes. Some potential causes include headache disorders, trauma, and certain medical conditions.

One possible cause of sudden pain in the top of the head when touched is a headache disorder. Headache disorders are a common cause of pain in the head, and can be triggered by a variety of factors, including stress, changes in sleep patterns, and certain foods. Some common types of headache disorders include tension headaches, migraine headaches, and cluster headaches. In some cases, touching the affected area can cause pain.

Another possible cause of sudden pain in the top of the head when touched is trauma. Trauma can occur due to a sudden impact or force, such as from a fall or a blow to the head. Trauma can cause a range of symptoms, including pain, swelling, and bruising. In some cases, trauma can cause a bone to break or a blood vessel to rupture, which can cause severe pain and other complications.

Certain medical conditions can also cause sudden pain in the top of the head when touched. For example, trigeminal neuralgia is a condition that causes sudden, severe pain in the face, often triggered by touching certain areas of the face. Other medical conditions that can cause this sensation include shingles, temporomandibular joint disorder, and chronic daily headaches.

In conclusion, sudden pain in the top of the head when touched can have a variety of causes. Headache disorders, trauma, and certain medical conditions can all cause this symptom. It is important to speak with a healthcare provider if this symptom persists or is accompanied by other concerning symptoms.