I think teenagers are as stressed as adults because of many reasons related mainly to school, friends, and family. Doing well at school involves a lot of pressure because they have to complete schoolwork, projects, and reports and study hard for exams. Then, there is also the stress of having a social life and being accepted by their peers in popular groups in addition to the physical stress which results from some emotional and physical changes which can leave adolescents confused and stressed.
finally, we can mention also the stress that comes from family problems and sibling rivalry.
To sum up, we can say that a lot of reasons can lead teenagers to stress, which can provoke violent reactions, depression, and health problems.

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Did you know that certain types of stress are good for you? It's true. Some types of stress can be good for you, but other types of stress disorders can cause serious health problems and threaten your life. Stress is one of the body's natural functions, but understanding the different types of stress will help you better know how to cope in life. Many types of stress are treated and diagnosed today, but they can be divided into four main categories: Positive Stress (Eustress), Negative Stress (Distress), Hyper stress, Hypostress.
Firstly, Positive Stress (Eustress). This is one of the useful types of stress. It appears as soon as you need to use your physical strength. Eustress prepares your muscles, increases your heart rate, and focuses your mind for any situation where you need to use muscle strength. Eustress can also be used in creative endeavors. Eustress helps them get the stimulation/arousal they need. An athlete will experience a surge of eustress power right after they play a big game or big game.
Secondly, Negative stress (Distress). Grief is one of the types of negative stress. It is one of those types of stress that the mind and body endure when normal habits have to be changed and adjusted. 
Thirdly, Acute Stress. It is a type of stress that occurs immediately after a change inhabits. It is powerful stress, but it happens very quickly. Symptoms of this type of stress are usually: headache, backache, stomachache, heart palpitations, muscle aches, or body aches.
Fourthly, Hyper stress. It is much for them to handle or bear.
A person experiencing hyper stress will often react to a not-so-stressful event with overwhelming emotion. This type of stress is important to be aware of because it can have serious emotional as well as physical consequences.
And finally, it is hypostress. It is the opposite of hyperstress. Hypostress occurs when the individual feels very depressed and boring or has no challenges in life. If you do the same things every day, in the same place, always meet the same old people, do the same job over and over, the same tasks are repeated, you will experience this type of stress. The effect of this type is a feeling of boredom and monotony as well as a lack of motivation to work.