Most sore throats are caused by viral infections like the common cold and flu, which means prevention comes down to keeping those viruses out of your body and keeping your throat’s natural defenses strong. The good news is that a handful of simple, everyday habits can significantly cut your risk.
Wash Your Hands at the Right Times
Your hands are the primary delivery system for cold and flu viruses. You touch a contaminated surface, then touch your face, and the virus reaches your throat within minutes. Washing with soap and water for at least 20 seconds is one of the most effective ways to break that chain. The CDC recommends scrubbing the backs of your hands, between your fingers, and under your nails, then rinsing under clean running water and drying with a clean towel.
The key moments to wash are before eating, after blowing your nose or sneezing, after using the bathroom, and after being in public spaces where you’ve touched shared surfaces like door handles, elevator buttons, or shopping carts. When soap isn’t available, a hand sanitizer with at least 60% alcohol works as a backup.
Keep Your Throat Moist
Your throat is lined with a thin layer of mucus that traps and removes viruses before they can take hold. This defense system, called mucociliary clearance, works best when it stays hydrated. Research shows that mucociliary clearance is faster and more effective at moderate humidity levels (40% to 50%) and slows dramatically when air is very dry. That’s one reason sore throats spike in winter, when indoor heating strips moisture from the air.
Two things help here. First, drink enough water throughout the day. The fluid lining your throat is replenished by glands in the airway and by water moving through your body’s tissues, so staying hydrated keeps that protective layer intact. Second, maintain indoor humidity between 40% and 60%. A simple hygrometer (available for a few dollars at any hardware store) lets you monitor levels, and a humidifier can bring dry rooms into the target range. This humidity sweet spot also reduces the viability of airborne viruses while staying low enough to prevent mold growth.
Get Enough Sleep
Sleep is when your immune system does its heaviest repair and surveillance work. People who chronically get less than seven hours of sleep per night are three times as likely to develop the common cold compared to those who regularly get eight hours or more. Since the common cold is the single most frequent cause of sore throats, protecting your sleep is one of the highest-impact things you can do. Aim for seven to nine hours consistently, not just when you feel run down.
Gargle With Saltwater
Gargling with a hypertonic saline solution (saltwater that’s slightly more concentrated than your body’s own fluids) has shown real protective effects against upper respiratory infections. The salt both mechanically dislodges viruses from the throat lining and has direct antiviral properties. Even gargling with plain water offers some benefit by physically washing away pathogens, but saltwater outperforms it.
To make a hypertonic solution, dissolve roughly half a teaspoon of salt in a cup of warm water, which puts you in the 1.5% to 3% concentration range that studies have found effective. Gargling once or twice a day during cold and flu season, or after being around sick people, is a low-cost habit with essentially no downside.
Avoid Smoke and Airborne Irritants
Exposure to cigarette smoke, even secondhand, dramatically increases throat inflammation. In one study of schoolchildren, those exposed to passive smoking were over three times more likely to experience pharyngeal irritation and had vastly higher rates of chronic throat inflammation compared to unexposed children. After adjusting for other factors, secondhand smoke exposure remained the strongest predictor of chronic pharyngitis by a wide margin.
If you smoke, reducing or quitting will lower your risk of recurring sore throats. If you live or work with smokers, minimize your exposure as much as possible. Other airborne irritants like strong chemical fumes, dust, and heavy pollution can have similar drying and inflammatory effects on the throat lining.
Clean the Air You Breathe Indoors
HEPA air purifiers can remove the vast majority of airborne viral particles from indoor spaces. In hospital settings, rooms equipped with HEPA-filtered air cleaners showed viral load reductions of up to 98%. You don’t need a hospital-grade system at home, but running a HEPA purifier in the rooms where you spend the most time, especially the bedroom, reduces the concentration of virus particles you inhale. This is particularly useful during winter months when windows stay closed and air recirculates.
Consider Zinc Supplements in Cold Season
Taking zinc regularly during cold and flu season may lower your chances of developing a respiratory infection. A review of clinical trials found that people taking oral zinc had a 32% lower risk of developing symptoms of a viral respiratory infection compared to those taking a placebo. The effect was even more pronounced for moderately severe symptoms, which were 87% less likely in the zinc group.
The studies used daily doses of 15 to 45 mg of oral zinc, taken consistently over several months. No serious side effects were reported at these doses, and copper levels (which high zinc intake can sometimes affect) remained normal. Zinc lozenges and oral supplements are both widely available. Starting them at the beginning of cold season, rather than waiting until you feel sick, is what the prevention data supports.
Stay Current on Vaccines
The flu is a major cause of sore throats every winter, and the annual flu vaccine is one of the most direct ways to prevent it. In the 2022-2023 season, vaccination was 71% effective against symptomatic influenza A infection. That’s a substantial reduction in your chances of spending a week with a raw, painful throat along with the fever and body aches that come with the flu. COVID vaccines similarly reduce the respiratory infections that often start with throat pain.
Replace Your Toothbrush After Illness
If you do get sick, swap out your toothbrush once you recover. Viruses and bacteria, including the strep bacteria that cause strep throat, can survive on toothbrush bristles and potentially reinfect you. The American Dental Association recommends replacing your toothbrush every three to four months under normal circumstances, but illness is a reason to replace it immediately. Store your toothbrush upright and uncovered so it dries between uses, and keep it away from other family members’ brushes to avoid cross-contamination.
Reduce Contact With Sick People
This sounds obvious, but the practical details matter. Cold and flu viruses spread most efficiently through close contact, meaning within about six feet, where you can inhale respiratory droplets from a cough or sneeze. When someone in your household is sick, small measures add up: don’t share drinking glasses or utensils, wipe down commonly touched surfaces like light switches and faucet handles, and keep some physical distance when possible. If you’re caring for a sick family member, washing your hands immediately after contact is the single most protective step you can take.