Feeling nauseous after working out is fairly common and can be caused by multiple factors related to hydration, nutrition, exercise intensity, and the body's physiological responses. Some key reasons include:

• Dehydration: Losing fluids through sweat without replenishing them can cause nausea, fatigue, and headaches. This is often signaled by dark yellow urine or urinating less frequently.

• Low Blood Sugar: Exercising without enough carbohydrates or food in the stomach may cause queasiness due to insufficient fuel for the body.

• Eating Too Soon Before Exercise: Consuming heavy meals or foods high in fat and protein too close to working out can delay digestion and cause nausea as blood flow shifts from the stomach to muscles.

• Blood Flow Redistribution: During intense exercise, blood moves away from the digestive tract to support muscles and skin, impairing digestion and leading to nausea.

• Lactic Acid Buildup: Especially after high-intensity workouts, lactic acid accumulation can cause body acidity that triggers nausea.

• Jostling Movements: Activities that involve a lot of motion, like running, can physically disturb the stomach and cause nausea.

• Heat and Overexertion: Exercising in hot conditions or pushing too hard can cause heat stress and nausea.

• Sudden Starts or Stops: Abrupt exercise without proper warm-ups or cool-downs can disrupt blood flow and cause nausea.

Overall, exercise-induced nausea is normal and common, especially with high- intensity workouts or endurance activities. Adjusting hydration, meal timing, intensity levels, and warming up/cooling down can help prevent it.