Why is One of my Nostrils Bigger Than the Other, but Yet I Don't Have Breathing Problems? (photo)

The main reasons to have surgery on the nose would be for either cosmetic purposes (appearance) or for functional purposes (nasal breathing). If a patient is breathing fine through the nose, there is no reason to perform surgery on a deviated septum.
Based on the photos provided, the overall shape of the nose is fine, but there appears to be some obstruction of the left nostril due to either deviation of the septum, or some irregularity of the cartilages at the tip of the nose. These issues can be corrected (or at least drastically improved) with surgery, but surgery would only be recommended if cosmetic changes are desired or there are nasal breathing problems.
Be sure to see a rhinoplasty expert.
All the best,

It is probably one of the more common questions my patients ask. It is normal for nostrils to be different in size or shape. Nostrils typically do not effect breathing unless they are very small or collapse while breathing. No surgery is necessary if there is no problem with breathing through the nose.