Why the young throwing shoulder is vulnerable
Throwing a baseball is one of the most violent motions in sports, and the shoulder is what pays for it. The arm internally rotates at thousands of degrees per second, and a handful of small muscles and ligaments have to control that. In a still-growing athlete, those structures, and the growth plate at the top of the arm bone, are doing that job before they are fully mature.1 That is why throwing shoulder pain deserves attention rather than a shrug.
Normal soreness vs a real problem
Not every ache is an alarm. The trick is knowing which signals to respect. A useful rubric from sports-medicine practitioners:2
| Likely normal soreness | Likely a problem |
|---|---|
| Diffuse, spread across the muscle | Localized to one spot, especially the joint |
| Mild and dull | Sharp, or significant |
| Fades within about 1 to 3 days | Lingers beyond a few days |
| Eases as he warms up | Present at the very start of throwing |
| No effect on velocity or command | Velocity or command drops off |
| No weakness, no night pain | Weakness, or pain at night and at rest |
A simple test: if your pitcher needs Advil or Tylenol in order to throw, that is pain, not normal soreness. And pain that is worst at the start of throwing, rather than easing as he warms up, is a red flag.
The common culprits in young throwers
You do not need to self-diagnose these, but it helps to know what a doctor is looking for:
- Rotator cuff tendinitis. Irritation of the small stabilizing muscles, often felt as an ache with overhead motion and sometimes weakness.3
- Labral or SLAP issues. Wear or tearing of the cartilage rim that deepens the shoulder socket, a classic overhead-throwing injury.3
- Internal impingement. Repetitive throwing can pinch the back of the shoulder in the cocked position, a leading cause of posterior shoulder pain in throwers, often alongside a loss of internal rotation.4
- Little League shoulder. A stress injury of the growth plate at the top of the arm bone, seen mostly in pitchers aged 11 to 16, that shows up as gradual shoulder pain with throwing and often a drop in velocity.5
When to see a doctor
The orthopedic and sports-medicine consensus here is refreshingly clear. Take any throwing shoulder complaint seriously, and seek care for pain that does not go away or that comes back every time your child resumes pitching.1 More specifically, see a sports medicine professional if you notice:6
- Pain that persists, or returns every time he goes back to throwing.
- Night pain or pain at rest.
- Weakness or a loss of motion compared with the other arm.
- A drop in velocity or command, which is often the earliest sign.
- Localized, sharp joint pain, or pain at the very start of throwing.
- Any pain that is not improving with rest.
Joint pain in a young thrower's shoulder or elbow is one of the first signs of injury and should never be ignored or pushed through. The instinct to tough it out is the single most expensive instinct in youth baseball.
The good news
Here is the reassuring part. The large majority of youth shoulder issues, including Little League shoulder, respond very well to one underrated treatment: rest from throwing, followed by a gradual, structured return.5 Caught early, most young pitchers are back on the mound without surgery and without lasting damage. The cases that turn serious are usually the ones that got ignored. So when something feels off, the move is simple. Stop throwing, and get it looked at. An early, boring answer beats a late, expensive one every time.
Education, not a medical diagnosis or treatment plan. If your pitcher has pain, consult a qualified sports-medicine professional.
Originally published on CritchPitch.