My father-in-law has been complaining about his knees for years. "It's just old age," he says. But "old age" is a collection of specific problems, and some of them are treatable.

After taking him to several appointments and doing my own research, here's what I've learned about the main causes of elderly joint pain.

Cartilage wear (osteoarthritis)

This is the most common cause. The cartilage that cushions the ends of bones gradually wears down over decades of use. As it thins, bone rubs against bone, causing pain, stiffness, and reduced mobility.

It's not reversible, but it is manageable. Weight management reduces the load on joints. Low-impact exercise (swimming, cycling) maintains joint function without further wear. And supportive aids like knee braces or walking sticks can make a meaningful difference.

Joint effusion (fluid on the knee)

When a joint is irritated — whether from arthritis or injury — it can produce excess fluid. This causes swelling, stiffness, and a feeling of "tightness" in the joint.

Rest, ice, and anti-inflammatory medication can help. If the effusion is significant, a doctor may drain the fluid, which provides immediate relief. The key is identifying and treating the underlying cause.

Bone spurs (osteophytes)

These are bony projections that develop along joint margins, often as the body's response to cartilage loss. They can rub against surrounding tissues, causing pain and restricting movement.

Most bone spurs don't need treatment unless they're causing significant discomfort. Physical therapy, stretching, and anti-inflammatories are usually sufficient. In severe cases, surgery may be considered.

What I've learned

Old age isn't a disease — it's a stage of life. Pain isn't something seniors have to accept as inevitable. Modern medicine offers many options for managing and treating the specific causes of joint pain.

If your elderly parents are in pain, don't let them dismiss it as "just getting old." Get a proper diagnosis. There's a good chance something can be done.

After my father-in-law got a proper evaluation and started a tailored exercise program, his walking improved noticeably within two months. He still has good days and bad days. But the trajectory is better. And that's worth it.