Both stress and ADHD feed into each other like yin and yang. ADHD can cause you to stress by hampering your ability to filter external stimuli like noises. While too much stress can trigger ADHD symptoms.
To top it off, many ADHD adults already have high levels of stress because 50 percent of them have an anxiety disorder.
It is important you manage your stress levels to prevent them from triggering ADHD symptoms. An easy way to manage stress is to take breaks when you feel the need to. You can also try exercising.