You may be having a silent migraine. When I have a migraine coming on, I know immediately because everything looks sharper, colors brighter and I can smell things so much better. read more
Hormonal changes are the most common reason for a heightened sense of smell, especially those that occur during menstruation and pregnancy. There is also evidence to suggest that people who have lost a major sense like sight or hearing experience a heightening in their other senses to compensate for the loss. read more
To perceive a smell, molecules float into the nose and bind to tiny hairs called cilia, triggering neurons that pick up on the odor. Taste buds on the tongue have taste cells that sense primary flavors. Occasionally, people experience heightened senses of taste or smell, making them more sensitive to flavors and odors. read more