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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.
According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
![(A) Lumbar puncture, also known as spinal tap; (B) section of the vertebral column showing the spina](https://biology-forums.com/gallery/47/medium_14755_07_10_12_3_22_05_93422479.jpeg)
![An oscillating needle 1 or 2 inches Hg below normal could indicate an incorrect air–fuel mixture ...](https://biology-forums.com/gallery/29/medium_548020_30_05_17_4_15_51_29687328.png)