Unless you have. A clear cut deformity - medical history, examination and x-ray are usually required to make an accurate diagnosis.
Move it. If you can move it or it's not deformed, it's likely not broken. If you can but with pain, then it may be broken. The only way to know for sure is by x-ray.
X-rays. If you recently sustained trauma to your finger and there is any cause for concern that it might be broken, have a hand surgeon examine the finger and obtain plain film radiographs. Most broken fingers are swollen, painful to move and will have x-ray findings of a fracture. Frac.
Xray. See your physician. An xray is the most effective way to diagnose a broken bone.
Pain and swelling. The location and character of the fracture makes a big difference on how hand fractures present and are treated. Traditionally fractures present with pain and swelling, but symptoms can also include stiffness and clinical deformity of the finger.
Obtain an X-ray. If you had a recent injury and are concerned that you have a broken finger, you should see a physician and obtain x-rays of the finger.
Finger. Following injury, if swelling, pain or discomfort, with limited range of motion, need an x-ray.
Usually can't. Unless it's has obvious deformity or is angled to the side, you really can't tell. X-rays, combined with physical examination & a medical history - are used to accurately diagnose the injury. Take car.
You really don't. Know in the absence of marked angulation or deformity. If you have a significant injury - a physician will evaluate and x-ray would normally be used.