Everyone experiences anxiety at one time or another. Walking through a dark parking garage, giving a presentation or losing a job can trigger it. Anxiety is defined as a feeling of fear or apprehension, and it may occur without any known cause. Fearful thoughts are often accompanied by sweating, rapid heart beat, dry mouth, tense muscles, headache, diarrhea and difficulty sleeping. Complaints of a stomachache may be the only symptom in a child. A variety of illnesses can cause anxiety.
Anxiety Disorder
Although it is normal to feel anxious at times when facing a stressful situation, sufferers of an anxiety disorder may feel constant tension, worry and fear that interfere with relationships, school and work. They may experience a sense of looming dread, be plagued by unrealistic fears and avoid everyday situations that provoke anxiety. Physical symptoms of anxiety accompany these thoughts and feelings. Obsessive compulsive disorder, general anxiety disorder, post-traumatic stress disorder, phobias and social anxiety disorder are all types of anxiety disorders. A medical professional should be consulted for signs of an anxiety disorder. Anxiety disorders often respond quickly to treatment, according to Helpguide.org.
Hyperthyroidism
An overactive thyroid gland, or hyperthyroidism, can cause symptoms of anxiety. Hyperthyroidism causes the overproduction of the thyroid hormone thyroxine, resulting in an accelerated metabolic rate that causes weight loss even though appetite may increase, difficulty sleeping, rapid pulse, frequent bowel movements, inability to tolerate heat, shaking and anxiety, according to Merck Manuals Online Medical Library, Professional Edition. It is rare for hyperthyroidism to cause anxiety without other symptoms. Treatment of hyperthyroidism depends on the cause, and may include anti-thyroid medications, iodine, radioactive iodine and surgery.
Cancer
Cancer of any type is a serious illness that commonly causes anxiety, depression and fear. Fear of death, changes in work or family roles, fear of suffering and pain, and loss of control affect emotional health, the American Cancer Society explains. Angry outbursts, irritability and uncontrolled worry can occur, affecting family members as well as the patient. The American Cancer Society advises friends and family to share feelings and fears, and to offer support and not discount a patient's worries. Support groups, counseling, and anti-anxiety or antidepressant medications can help alleviate anxiety.
