I broke my wrist and now there is a hard bump inside arm what it from?

There are a few possible reasons why you might have a hard bump inside your arm after breaking your wrist.

1. Bone fragments. When you break your wrist, it is possible for the bones to break into small fragments. These fragments can then shift around and form a hard lump.

2. Tendonitis. Tendonitis is inflammation of the tendons, which are the thick cords that connect muscles to bones. When the tendons around your wrist are inflamed, they can swell and form a hard lump.

3. Ganglion cyst. A ganglion cyst is a fluid-filled sac that can develop on the tendons or joints of the wrist. Ganglion cysts are usually benign, but they can sometimes be painful.

4. Infection. If you have an infection in your wrist, it can cause swelling and the formation of a hard lump.

If you are concerned about the hard bump inside your arm, you should see a doctor to get a diagnosis. The doctor may recommend imaging tests, such as an X-ray or MRI, to determine the cause of the lump.