If you have a bump in your back of head what does it mean and headaches that go away seconds?

A bump on the back of the head can have various causes, and it's important to consult with a healthcare professional for proper evaluation and diagnosis. Here are some possible causes of a bump on the back of the head:

1. Lipoma: Lipomas are benign fatty growths that can occur anywhere on the body, including the scalp. They are usually soft, movable, and painless.

2. Sebaceous cyst: Sebaceous cysts are noncancerous growths that arise from blocked sebaceous glands. They are usually small, round, and can be filled with a cheesy material.

3. Pilar cyst: Pilar cysts are benign growths that originate from hair follicles. They are typically small, firm, and can be painful if they become infected.

4. Muscle knot: Muscle knots or trigger points can develop in the muscles of the scalp due to tension, stress, or overuse. They can feel like firm bumps and may be tender to the touch.

5. Osteoma: An osteoma is a benign bone growth that can occur on the skull. It is usually hard, immobile, and painless.

6. Skull fracture: A skull fracture, although less common, can also result in a bump on the head. Skull fractures require immediate medical attention.

Regarding headaches that go away in seconds, they could be brief tension-type headaches or quick-resolving migraines. Tension headaches are the most common type of headache and are characterized by a mild to moderate aching or pressure-like pain around the head. Migraines, on the other hand, are severe headaches that typically involve throbbing pain on one side of the head, often accompanied by nausea, vomiting, and sensitivity to light and sound. If you are experiencing frequent or severe headaches, it's important to see a doctor to determine the cause and receive appropriate treatment.