It's Not Just in Your Head — These Are the Physical Symptoms of Anxiety

This is one of the most common symptoms of anxiety: when your fight-or-flight response kicks in, this ups your heart rate, sometimes leading to heart palpitations.

"In the short term, our heart rate and breathing increases, and adrenaline floods through our body to give us energy to fight or run away," explained Sarah Allen, PhD, a Chicago-area psychologist who specializes in treating anxiety and stress. "That is useful for dangerous situations, but typically we don't face that sort of situation; our mind is just telling our body that our thought is dangerous, and so we find that this anxiety response is activated in inappropriate settings like traffic or during a stressful conversation."

Dr. Allen explained that if this happens occasionally, there is no long-term harm effect on your body. However, if this is a persistent symptom, you should see a doctor to avoid further complications.

When that adrenaline pumps through your body, it can cause your muscles to tense up, resulting in knotted muscles in your back or neck, explained Sari Chait, PhD, clinical psychologist and consultant.

The tensing up of your muscles, especially in your neck, can lead to headaches or even migraines. Dr. Chait said getting headaches from anxiety is pretty common.

Dr. Chait told POPSUGAR that feeling dizzy or lightheaded happens frequently with anxiety, along with the other symptoms listed here.

"Some people experience a change in their appetite when they're anxious, either eating way more than usual or significantly less than usual," Dr. Chait said. If you're an emotional eater, you may find yourself turning to your favorite comfort foods to help you feel better. If this sounds like you, try our helpful trick to help curb emotional eating.

This is a common symptom of anxiety: that uncomfortable feeling in your stomach that comes along with nerves and is associated with the fight-or-flight response, explained Brian Cassmassi, MD, licensed psychiatrist in Los Angeles. There is actually a powerful gut-brain connection — your brain has a direct effect on the stomach and intestines, including how feelings of anxiety can lead to stomachaches and GI issues.

If your anxiety is bad enough, the butterflies in your stomach could lead to full-on GI issues, such as irritable bowel syndrome (IBS) with diarrhea and/or constipation, Dr. Cassmassi said.

"Serotonin is the neurochemical that controls both gut activity as well as mood and anxiety, so the reduced serotonin in chronic anxiety states also can wreak havoc on the gut," Dr. Cassmassi explained.

While some people may feel wired when they're anxious, fatigue is actually a common symptom of anxiety, Dr. Chait said.

"When feeling anxious, some people feel pretty fatigued, which is worsened by the emotional drain of anxiety," she explained. "Despite this fatigue, anxiety also causes sleep difficulty for a lot of people, so there is a vicious cycle of feeling tired but not getting enough sleep, which leads to feeling even more fatigued."

If this sounds like you, try a weighted blanket to help soothe you to sleep. If that doesn't work, try a breathing technique or other wind-down routines that can help ease anxiety.

Ultimately, you should work with your mental healthcare provider to create a treatment plan that will help relieve your anxiety and help you get a good night's sleep.