Tension is mental or emotional strain, suspense, anxiety, or excitement .
Anxiety is a reaction to a real or imagined threat, a general feeling of uneasiness or dread.
The most frequent undesirable reaction is anxiety. Anxiety is often accompanied by twitching or trembling , muscle tension, headaches , sweating , irritability, fatigue , nightmares , memory problems, sexual impotence , sleeplessness , dry mouth, or difficulty swallowing . The degree of anxiety is much more a function of the individual than the degree of stress. The risk of anxiety increases with stress, a family history of neurosis, fatigue or overwork, or the recurrence of situations that have been previously stressful or harmful. Insomnia and an inability to concentrate are common symptoms of anxiety which can lead to a vicious cycle that makes the problem worse.