Hepatitis C spreads through blood-to-blood contact. The virus enters your bloodstream when blood from an infected person reaches yours, most commonly through shared needles or syringes. Unlike hepatitis A, you can’t catch it from contaminated food or water, and unlike a cold, you can’t get it from casual contact like hugging or sharing a drink.
Shared Needles Are the Leading Cause
Sharing needles, syringes, or any other equipment used to prepare or inject drugs is the most common way people get hepatitis C today. This includes cookers, cotton filters, and water used to dissolve drugs. Even a tiny amount of infected blood left on equipment can transmit the virus, partly because hepatitis C is remarkably durable: it can survive on dry surfaces for up to six weeks, far longer than HIV or hepatitis B.
This means that equipment doesn’t need to look visibly bloody to carry the virus. Rinsing a syringe with water isn’t enough to eliminate it. If you’ve ever shared injection equipment, even once and even years ago, getting tested is worthwhile. The U.S. Preventive Services Task Force recommends hepatitis C screening for all adults aged 18 to 79, and most people only need to be tested once. Those who continue to inject drugs should be tested periodically.
Blood Transfusions and Medical Procedures
Before 1992, blood transfusions were a major source of hepatitis C infections because donated blood wasn’t reliably screened for the virus. If you received a blood transfusion or organ transplant before that year, you may have been exposed. Today, improved screening has reduced the risk of getting hepatitis C from a transfusion to roughly 1 in 100,000 to 1 in 200,000, making it extremely rare in countries with modern blood banking.
In parts of the world where medical equipment is reused or inadequately sterilized, unsafe injections and procedures in healthcare settings remain a significant route of transmission. The World Health Organization identifies reuse of syringes and needles in healthcare as one of the most common transmission routes globally.
Needlestick Injuries in Healthcare Workers
Healthcare workers who accidentally stick themselves with a needle used on an infected patient face a relatively low risk. Studies tracking nearly 900 such exposures in the U.S. found that about 0.2% resulted in hepatitis C infection. That’s roughly 1 in 500 needlestick incidents. Contact with mucous membranes (such as a blood splash to the eyes) carries an even lower risk. Still, any occupational exposure warrants follow-up testing.
Tattoos and Piercings in Unregulated Settings
Getting a tattoo or piercing at a licensed, professional shop does not appear to carry a meaningful hepatitis C risk. Research reviews have found no definitive evidence of increased infection rates from regulated parlors that follow standard sterilization practices.
The picture changes sharply in unregulated settings. Tattoos done in prisons, at home, or by unlicensed individuals carry a significantly elevated risk, with studies showing two to nearly four times higher odds of hepatitis C infection. The issue is shared or improperly cleaned equipment: tattoo guns, ink pots, and needles that carry traces of blood from one person to the next.
Sexual Transmission
Hepatitis C can spread through sex, but this is far less common than with hepatitis B or HIV. The risk is highest during sexual contact that involves blood exposure. Research from New York City tracking HIV-positive men who have sex with men found that two behaviors were the strongest predictors of acquiring hepatitis C sexually: unprotected receptive anal intercourse and having sex while using methamphetamine. The second factor was the single strongest predictor, likely because stimulant use is associated with rougher or more prolonged sexual contact that causes tissue tears and bleeding.
HIV coinfection plays a role too. People living with HIV who also carry hepatitis C tend to have higher levels of the virus in their blood, which increases the chance of passing it to a partner. Other sexually transmitted infections that cause open sores, like syphilis and herpes, can also create entry points for the virus. For people in long-term monogamous heterosexual relationships where one partner has hepatitis C, the risk of sexual transmission is very low.
From Mother to Baby During Pregnancy
A pregnant person with hepatitis C can pass the virus to their baby during pregnancy or delivery. This happens in roughly 6% to 7% of exposed pregnancies. If the mother also has poorly controlled HIV, the risk climbs to about 11% to 12%. There is currently no intervention during pregnancy proven to prevent this transmission, which is one reason screening during pregnancy is now recommended. Cesarean delivery has not been shown to reduce the risk.
Ways Hepatitis C Does Not Spread
Hepatitis C is not spread through breast milk, food, or water. You cannot get it from hugging, kissing, holding hands, sharing utensils, or sharing food and drinks with someone who is infected. Coughing and sneezing don’t transmit it either. It requires blood-to-blood contact, so the everyday interactions people worry about most are not a risk.
Personal Items That Can Carry Blood
Because the virus survives on surfaces for weeks, sharing personal items that might carry microscopic amounts of blood is a real, if less common, transmission route. Razors, toothbrushes, nail clippers, and glucose monitors can all harbor tiny blood traces. If you live with someone who has hepatitis C, keeping these items separate is a simple precaution. The virus is tough, but standard household bleach solutions can kill it on surfaces.
Who Should Get Tested
The U.S. Preventive Services Task Force recommends a one-time hepatitis C screening for all adults aged 18 to 79, regardless of risk factors. Pregnant people should be screened during each pregnancy. If you have ongoing risk factors, like current injection drug use, periodic retesting makes sense. People younger than 18 or older than 79 who have risk factors should also discuss testing with a provider.
Hepatitis C often produces no symptoms for years or even decades, so many people don’t know they carry the virus until liver damage has already begun. Testing involves a simple blood draw, and today’s antiviral treatments cure more than 95% of infections, typically in 8 to 12 weeks.