Sometimes i have anxiety for no reason..like i all if a sudden start to feel hot n start to panic...why is this?

Panic Attacks?: There are a number of different types of anxiety disorders. A common type of anxiety reaction is a panic attack. These typically occur suddenly and can have a variety of symptoms such as anxiety, sweating, feeling hot, short of breath, shaky, chest discomfort, etc. Panic attacks sometimes occur in response to specific triggers, but often are completely random events with no identifiable cause.

Panic: You might be experiencing panic attacks. Schedule appointment with your pcp to evaluate & run lab work to rule out organic causes of anxiety first.