The first example is actually the most common one, yet people seem to ignore the fact that their stomach ache is related to stress or anxiety. This can happen at any age for different reasons, such as the stress and anxiety of having a test the following day or just a date.
Stress is even capable of making you run to the bathroom every 5 minutes. Caffeine intake is also not the best option since it can mess up your digestive system, so don’t drink coffee, especially if you feel stressed!
Overall, positive stress is something you should not worry about since it’s not harmful to your health, however, if you feel stressed very frequently you might suffer from stress disorder, and in that case, you should visit a doctor or try to do some activity that relaxes you, like dancing or meditation.