Section

Joints

The newest area: the knee, shoulder and hip that started complaining, and the question almost nobody asks first — which of three different diseases is actually doing this. Five articles published so far, with the rest arriving one at a time.

Start with the guide

Joint Pain After 40: What's Actually Wearing Down
Ordinary wear, an autoimmune disease, or the delayed effect of an old injury — the same ache can be any of three different problems, and each one needs a different next step.

Joint by joint

Each joint fails in its own way, and each one gives away which problem it is differently.

Knee Pain: What's Different About Where It Hurts
Front, outside, behind, or a sudden balloon of swelling — four different locations, four different usual causes, and a warning sign that can mimic a blood clot.
Shoulder Pain After 40: What the Arm Can't Do
The shoulder sorts by what the arm can still do, not by where it hurts. One ten-second test at home splits most of it: can someone else lift your arm for you?
Hip Pain Explained: Why It's Often Not the Hip
The hip sorts by how the pain started before where it is felt — and a lot of what gets called hip pain, especially in the buttock, is not the hip joint at all.

Telling similar diagnoses apart

Same symptom, different disease — and a different plan depending on which it is.

Osteoarthritis vs Rheumatoid Arthritis: What Differs
How long the stiffness lasts, whether both sides hurt, and why rheumatoid arthritis is racing a clock that osteoarthritis is not.

Being written now

These are planned, in this order, one at a time — not yet published, so no links yet.

Rotator cuff vs frozen shoulder — two diagnoses, two different treatments.
Knee replacement — what gets tried first, and what recovery involves.
Meniscus tear — injury or wear, and why imaging can blur the two.
Glucosamine for joint pain — what the evidence actually shows.

Where joints meet the other sections

This is one man with one body, not four unrelated subjects.

The testosterone section
Muscle that used to support a joint loses mass with both ordinary aging and low testosterone — two different mechanisms that can add up in the same knee.
The sleep section
Joint pain that flares at night is one of the more common reasons a man's sleep breaks up after 40.
The prostate section
Eighteen articles, from the first change you notice to whether any supplement is worth trying.