If your spouse snores, you should closely observe him or her at night to see if there are breaks or pauses in breathing. Another sign of OSA is daytime somnolence. If either of these is present, or if the snoring is excessively loud, you should definitely bring it to your doctor's attention. The etiology and the risk factors for snoring are very similar to those of OSA, so the discussions on that disorder linked above will overlap much of the material here. Snoring is known to be more common in overweight individuals.
Difficulty breathing through the nose can worsen snoring.
Before treatment for snoring can be considered, it is important to make determine if significant sleep apnea is present. This usually requires an overnight sleep study. Treating the sleep apnea usually also will correct the snoring. Since there can be health consequences of untreated sleep apnea, this takes priority. If only snoring is present, it is actually treated using methods similar to treatment of mild sleep apnea.