If you are eating spicy or hot foods, you may experience a runny nose without any other symptoms, which is referred to as gustatory rhinitis. According to Medical News Today, "When a person eats these foods, a nerve called the trigeminal sensory nerve is stimulated, which causes the nose to run."

For a person to help prevent gustatory rhinitis, it is advised to avoid triggering foods. However, if your nose reacts after eating any food, there are medications to help people manage their symptoms.

Additionally, your nose may run if you have a food allergy, which is referred to as allergic rhinitis. A person's symptoms may also include watery eyes, sneezing, fatigue, and in mild or severe cases, hives, body swelling, coughing, and even anaphylaxis.