What causes back cracking, why a painless pop is normal, what research shows about arthritis risk, and the symptoms that mean you need an exam.

Why walking after a knee pop doesn't rule out an ACL tear, plus what to do in the first 48 hours, how it's diagnosed, and recovery timelines.

What a shoulder MRI can and can't show, when a rotator cuff tear needs surgery, why it hurts at night, and the red flags that need urgent care.