In general, it is normal for both breasts to differ in volume and size. Hence it may be a normal variation in your case.
Otherwise Breast enlargement (sudden onset) in a unilateral breast can be due to inflammation or bacterial infections. Gradual breast enlargement can be due to hormonal imbalances or developments of lumps in the breast.
Most breast lumps, particularly in younger women, are not caused by cancer but are benign, non-cancerous lumps.
Such lumps can include cysts, fibroadenomas and pseudolumps
Cysts are fluid filled cavities within normal breast tissue. A cyst can move around and can change in size during your menstrual cycle.
Fibroadenomas are benign overgrowths of supportive tissues and glands, which appear as hard or firm lumps in the breast.
Pseudolumps are non breast tissue lumps originating from scar tissues, necrosis of fat tissue, etc.
In most cases a physical examination by a doctor can help in diagnosis of the underlying condition. You should seek a opinion from your doctor who can help you accordingly.
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