What is the difference between Hypochondriasis and Somatization Disorder?

Hypochondriasis is a mental illness caused by an excessive irrational concern for one’s health and conviction in the presence of a disease. It occurs mostly in elderly people. Symptoms for hypochondriasis include the fear of having or based on a misinterpretation of symptoms.

A patient/client with hypochondriasis spends a lot of time searching online for various symptoms of the disease. Hypochondriasis diagnosis is performed with the involvement of a various medical specialist.
Somatization disorder is defined as the presence of physical complaints about a period longer than 6 months.

Somatization disorder occurs mostly in women, people with somatization disorder suffer from a disorder like anxiety, depression fear, etc. Different patients with different symptoms of somatization disorder, meaning that each patient possesses different types of symptoms. It is believed that chronic stress is the main triggering factor of somatization disorder.