What’s a nightshade?

Types of nightshade plants include potatoes, tomatoes, peppers, red pepper flakes, eggplant, and paprika. A nightshade allergy is an immune response to the compound in nightshade plants called alkaloids.

Symptoms of a nightshade allergy include congestion, skin rash, itching, redness, and digestive problems. Food allergies are diagnosed with a skin prick test or blood allergy test. They are treated by avoiding the allergen and/or medications to reduce the immune response. Digestive problems can include but are not limited to bloating, inflamation, nausea, heart burn, constipation, Crohn's disease and leaky gut.
Source: https://www.verywellhealth.com/
Image credit: Alex Ghizila