Yes, you can get a cold sore from sharing a drink, because the herpes simplex virus that causes most cold sores (HSV-1) spreads through saliva and through items that touched it. The risk is highest while the other person has a sore, and MedlinePlus says the virus can sometimes spread even when there is no sore at all. About half of US adults already carry HSV-1, so one shared cup often changes nothing. If a first infection does cause symptoms, they most often show up 1 to 3 weeks after contact.
How does a shared drink spread a cold sore?
Cold sores are usually caused by herpes simplex virus type 1 (HSV-1). MedlinePlus says it spreads through close contact with someone who has it, or by touching an open sore or items that touched the virus, such as towels, dishes and razors. The CDC says most people with oral herpes get it in childhood or young adulthood from non-sexual contact with saliva.
A cup, can, bottle or straw carries saliva from one mouth to the next. That is why MedlinePlus says not to share utensils, straws, glasses or other items if someone has oral herpes, and the American Academy of Pediatrics (AAP) says to avoid sharing drinks, utensils, towels and toothpaste during an outbreak.
Can I catch it if they had no visible sore?
Yes, it is possible. MedlinePlus says oral and genital herpes can sometimes spread even when there are no mouth sores or blisters. The CDC says the skin can release the virus from areas with no visible sore, and that most people with oral herpes have no symptoms, so the person you shared with may not know they carry it.
The main risk time is while a sore is present. The NHS says cold sores are contagious from the first tingle until they have completely healed, and that they should start to heal within 10 days. No source we used gives a number for the chance of catching it from a single shared sip, so we do not give one here.
What else besides cups can pass it on?
Treat anything that goes from one person's lips to another's the same way as a shared cup, especially while someone has a sore.
- Cups, bottles, cans and straws, including drinks passed around at a party
- Forks, spoons and shared bites
- Lip balm and lipstick: our sources do not name these, but they touch the lips directly, so treat them like a shared cup
- Vapes, pods and anything else passed mouth to mouth: our sources do not name vapes, but they touch lips and saliva the same way a straw does
- Towels, razors and toothpaste, named by MedlinePlus and the AAP
- Kissing and oral sex. The CDC says HSV-1 can spread from the mouth to the genitals through oral sex
I already shared a drink. What now?
Try not to panic. A CDC survey from 2015 to 2016 found HSV-1 in about 41% of people aged 20 to 29 and about 54% of those aged 30 to 39. If you have had cold sores before, you most likely already carry the virus, and a shared drink is unlikely to add a new problem.
If you have never had HSV-1, a first infection may cause no symptoms at all, or it may cause sores. MedlinePlus says symptoms most often appear 1 to 3 weeks after contact. Watch for:
- Tingling, itching or burning on or around your lips
- Small blisters on the lips, gums, mouth or throat
- Sore throat, fever, swollen glands in the neck or painful swallowing, which can come before the blisters
- Swollen, painful gums with sores in the mouth, which the NHS says is a reason to see a doctor
When should you get care?
In an emergency, call 911Get care the same day if you have sores or blisters near your eyes. MedlinePlus says to contact a provider for this, and the AAP says HSV is the most common cause of cornea infections.
Contact a doctor soon if you have a weakened immune system (for example from chemotherapy or medicines that suppress immunity) and think you have a cold sore or first herpes infection.
Call a doctor the same day if a newborn has a blister-like rash or fever, or a child with eczema develops new blisters or sores.
Get care the same day if a headache comes with fever during an outbreak. The AAP says this can point to a brain infection such as meningitis or encephalitis.
See a doctor if mouth sores make it too painful to drink, if the skin around a sore gets red, swollen or hot, if a sore has not started to heal after 10 days, or if symptoms are severe or last more than 2 weeks.
Call 911 if a headache comes with confusion or a seizure during an outbreak.
How our AI doctor decides when to send you to care ›If a sore shows up, what helps?
The NHS says cold sores should start to heal within 10 days. A pharmacist can suggest antiviral cream, cream to ease pain, or cold sore patches, and the NHS says antiviral creams work best started at the first tingle. A doctor may prescribe antiviral tablets if a sore is very large, very painful or keeps coming back.
While it heals, wash your hands after touching it, keep your cups and lip balm to yourself, and do not kiss anyone. Never kiss a baby: the NHS says this can cause neonatal herpes, which is very dangerous for newborns, and the AAP says HSV is dangerous to babies under 6 months old.
Common questions
Can I get a cold sore from sharing a drink?
Yes. HSV-1, the usual cause of cold sores, spreads through saliva and items that touched it, and MedlinePlus says not to share glasses, straws or utensils with someone who has oral herpes. The risk is highest while the other person has a sore. About half of US adults already have HSV-1, so a shared drink often changes nothing.
Can I catch a cold sore from someone who has no sore right now?
It is possible. MedlinePlus says herpes can sometimes spread even when there are no sores or blisters, and the CDC says most people with oral herpes have no symptoms. Our sources do not give a number for this risk, so it is not zero, but you do not need to assume you caught it.
How soon would a cold sore show up after sharing a drink?
MedlinePlus says symptoms most often appear within 1 to 3 weeks after contact with the virus. A first infection can also cause no symptoms at all. If you have had cold sores before, a new one is most likely a flare of the virus you already carry.
Can I get a cold sore from sharing lip balm or a vape?
Our sources do not name lip balm or vapes as ways it spreads. Both touch the lips and carry saliva the same way a cup or straw does, so do not share them with someone who has a sore. The safest choice is to keep both to yourself.
Does washing a cup get rid of the cold sore virus?
MedlinePlus advises washing towels and linens in boiling hot water after each use during an outbreak. Our sources do not say how well washing a cup removes the virus. The simpler fix is not to share the cup while someone has a sore.
Pymander is not a replacement for a physician and does not provide medical advice, diagnosis, or treatment. Always seek the advice of a qualified health provider with questions about a medical condition. If you think you may have a medical emergency, call 911.