Asthma and chronic bronchitis
Lifters with chronic and severe breathing problems may end up with larger chests—but not stronger chests—than others. Childhood asthma may make your chest larger. This is a form of rib cage expansion—but not a recommended one.
However:As for whether dumbbell exercises can provoke this change, I am very doubtful.
Gynecomastia is common. It refers to the enlargement of the breast tissue in men. This is not the same thing as large and strong pectoral muscles. With gynecomastia, the nipples are often more pointed and puffier.
Gynecomastia... is a common condition, present in 30 to 50% of men. The disease, caused by hormonal imbalance at the breast tissue level, may occur both physiologically at some stages of life or be secondary to various disorders.Gynecomastia
This condition is not always a medical problem. It affects young men or boys going through puberty. It often goes away on its own. But sometimes its appearance can be more problematic.
It is different from simply being overweight—even thin and lean men can have gynecomastia. It involves the "glandular component" of the male breast. It does not impact the pectoralis major muscle strength or internal shape.
Overweight or gynecomastia?If you are unhappy with the shape of your chest muscles, this could be due to either of these conditions.
And:It is important not to be too quick to assume you have gynecomastia. Other problems may be present.
Being overweight—having excessive chest fat—will negatively impact the shape of your upper torso. It may seem very similar to gynecomastia. It is also possible have gynecomastia and also excessive fat tissue.
Tip:Engaging in a weight-loss and strength training program is helpful if you are unhappy with the shape of your chest.
So:Over time, this may resolve as you get in better shape. But if you lose fat and have true gynecomastia, medical treatment helps.
Life is not fair. Some of us are born with abnormalities—one such abnormality is called Poland's syndrome. This syndrome involves deformities to the pectoralis major muscles. Poland's syndrome affects both men and women.
It often leads to asymmetries in the pectoralis muscles and breasts on women. This can be helped with implants in men and women. In men, fat grafting can help even out the chest muscles. Strength training also helps.
The most common operation performed in women was breast reconstruction with silicone [implants]. Two men had their [chests] symmetrized by fat grafting.Surgical treatment of patients with Poland's syndrome
These tactics make the chest larger, firmer and stronger. Exercises such as dips, bench presses, pushups with correct form and squats are useful. Animal protein is beneficial. Weight gain promotes this muscular feature.