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There are several possible reasons why you might be feeling pain in your back after running:

1. Poor Running Form: If your running form is incorrect, it can put undue stress on your back, leading to pain. For example, if you lean forward too much while running, it can strain your lower back.

2. Weak Core Muscles: Your core muscles, which include your abs, back, and hips, are responsible for stabilizing your body while you run. If these muscles are weak, they may not be able to properly support your spine, leading to back pain.

3. Overuse: Running is a high-impact activity that can put a lot of stress on your back, especially if you run long distances or on hard surfaces. This can lead to overuse injuries, such as stress fractures or disc degeneration.

4. Inadequate Warm-Up: If you don't properly warm up before running, your muscles can be tight and more prone to injury.

5. Wearing the Wrong Shoes: Running shoes that don't provide adequate support can also contribute to back pain.

6. Underlying Medical Conditions: Certain medical conditions, such as arthritis or disc disease, can cause back pain after running.

If your back pain persists, it's a good idea to see a doctor or physical therapist. They can help identify the cause of your pain and recommend appropriate treatment.