Why Do I Feel Nauseous After Working Out?

Post-workout nausea affects up to 20% of people and has several common causes. During intense exercise, blood flow shifts away from your digestive system to working muscles, which can trigger nausea. Dehydration may contribute to nausea and digestive discomfort, particularly when exercise causes substantial fluid loss. Eating too close to your workout can also be problematic, as your body struggles to digest food while exercising. Low blood sugar levels after prolonged exercise may contribute to nauseous feelings. To help prevent nausea, drink appropriate amounts of fluid before and during exercise, avoid large meals for 2-3 hours beforehand, and consider a small carbohydrate-containing snack after a long or intense session. Stop exercising and seek medical advice if nausea is severe, keeps happening, or occurs with repeated vomiting, chest pain, fainting, confusion, or other concerning symptoms.