Anxiety is defined similarly to stress. It is considered a reaction to stress, and it can be normal at manageable levels, according to the National Institute of Mental Health website. It is thought of as fear of future events, with physical reactions like sweating and tension, as well as doubting one’s capabilities to handle the future, according to the Merriam-Webster online dictionary. An article on Medical News Today also states that “it feels a bit like fear but whereas we know what we are frightened of, we often don't know what we are anxious about.”
Anxiety can also progress into a disorder that can affect everyday life and functioning. Multiple anxiety disorder has five main types according to the NIMH website, including generalized anxiety disorder, obsessive-compulsive disorder, panic disorder, post-traumatic stress disorder and social phobia/social anxiety disorder.
https://www.empowher.com/mental-health/content/what-it-means-have-anxiety