Exercise is known to promote relaxation, combat stress and elevate mood. So if you leave the gym feeling sick, it can be a warning signal that you are not doing something correctly. Your body may be saying that you have made too great an effort or the fluid intake was not right. If you do not feel well after exercising, evaluate your pre-workout routine and activity regime to find out why.
Your body needs a lot of fluid to keep it working well, and if you exercise, you need to increase your fluid intake. If you do not drink enough water, your body becomes dehydrated due to fluid loss caused by excessive sweating during your workout, says the American Council on Exercise. You may feel very tired and lethargic, with nausea and experience unusual muscle pain after training if you are dehydrated.
Although it is necessary to drink to stay hydrated, it is possible to exaggerate with water. The American Council on Exercise says that most women need about 91 ounces of water per day (3 liters) and men need about 125 (4 liters). Drinking excessive amounts of water can lead to a condition known as hyponatremia, which occurs when sodium levels in the body are too low. Overhydrating can cause you to feel very nauseous after a workout.
Your blood sugar levels may change based on the amount and type of food you eat and the intensity of your activities. High blood sugar, consuming too much sugar in your food without releasing it, can cause dizziness and nausea. A low blood sugar level, not eating enough before exercising and trying too hard, can cause the same symptoms. This low level of sugar can also cause tremors and weakness.
Overtraining is a common cause of not feeling well after a workout. It occurs when you have worked too hard and your body responds physically and emotionally to wear. Overtraining can cause mood swings, extreme fatigue and a general feeling of illness, says the American Council on Exercise. Overtraining can also cause persistent pain in the joints or muscles and frequent illnesses due to a weakened immune system.