Strep Throat (Strep A): How to Recognise It and What to Do

Strep throat is an inflammation of the throat, and particularly the tonsils, caused by a bacterium called group A streptococcus (Streptococcus pyogenes), often shortened to strep A. Most sore throats are caused by viruses and usually clear up on their own, whereas strep throat has a bacterial cause. This distinction matters, because it helps explain why sore throats don't all show up in the same way or need the same medical care. Biologically, the body responds to the bacterium by triggering a local immune response. The tonsils, which sit at the back of the throat and act as sentinels of the immune system, are central to this. Their job is to trap and neutralise germs such as viruses and bacteria that enter through the mouth or nose. When group A streptococcus colonises this area, it can cause visible, uncomfortable inflammation. Strep throat differs from a passing irritation because it results from a specific interaction between the bacterium and the immune system. The inflammation isn't just a source of discomfort: it reflects the body's defence at work, mobilising white blood cells and chemical mediators to contain the bacteria's spread.

Strep Throat: Red or White Tonsils?

Sore throats are often described as "red" or "white" depending on how the tonsils look. Strep throat can appear in either form: red when there is marked inflammation, or white when whitish patches form on the tonsils. In both cases, it is a localised throat infection that usually stays limited, but appearance alone can't confirm the cause, since viral sore throats can look similar. A pharmacist or GP can help work out what is going on.

Several factors can increase the risk of strep throat, including the environment, personal susceptibility, and certain lifestyle habits. Exposure to group A streptococcus (strep A) doesn't automatically lead to infection: it depends on how the body responds and on the surrounding environment. Here are the most commonly cited factors.

Environmental Causes

Strep throat is more common in winter and spring, when cold, dry air may weaken the mucous membranes in the throat. During this period, temperature changes, central heating, and indoor air quality can leave the throat's local defences more vulnerable. These conditions can make an infection more likely to take hold once a person comes into contact with the bacterium.

Causes Linked to Individual Susceptibility

Some people are more susceptible to infection than others. Children and teenagers are particularly at risk because their immune systems are still developing, and school brings them into close contact with classmates. Individual predisposition may also play a part: some people carry group A streptococcus in their throat more easily, sometimes without noticeable symptoms. These people are known as asymptomatic carriers, and they can pass on the bacteria while being relatively unaffected themselves. The immune system also plays a role. When someone is tired, under prolonged stress or run down, their natural defences may be less effective, making it easier for bacteria to multiply.

Lifestyle-Related Causes

Certain lifestyle factors may make strep throat more likely. Not getting enough sleep or eating a diet low in nutrients that support the immune system can reduce the body's ability to fight off an infection. Chronic stress can also play a part, as it may affect hormonal balance and weaken the immune response. Smoking or exposure to second-hand smoke can irritate the throat too, which may make it easier for strep A to take hold.

Yes, group A streptococcus (strep A) is contagious and can spread easily from one person to another. It spreads mainly through the tiny droplets released when an infected person talks, coughs or sneezes. Hands and shared items such as glasses, cutlery, toys and door handles can also carry the bacteria temporarily. Close contact in crowded or enclosed spaces, particularly in winter, makes it more likely to spread.

If a healthcare professional diagnoses strep throat and prescribes antibiotics, health guidance generally advises staying away from school, nursery or work until at least 24 hours after the first dose, which helps stop the infection spreading. Local recommendations can vary, so a healthcare professional can advise on the right timing for your situation.

• Intense Sore Throat: The pain is often sharp and worsened when swallowing, as the inflammation directly affects the tonsils and the lining of the throat

• Redness of the Throat: The visibly red or inflamed appearance reflects the local immune system’s reaction to the presence of streptococci

• Presence of Whitish Deposits: In some cases, a white or yellowish coating may appear on the tonsils, a sign of an active immune response against the bacteria

• Fever: An increase in body temperature is a natural defence mechanism designed to limit bacterial proliferation

• Swollen Neck Lymph Nodes: The lymph nodes react by filtering and mobilising immune cells, which can make them tender or painful to the touch

• Headaches and Tiredness: The body uses some of its energy to fight the infection, which can lead to tiredness and sometimes headaches

• Nausea or Abdominal Pain (especially in children): Some children experience an associated digestive reaction, linked to their body’s sensitivity to ENT infections

• Absence of a Cough: Although this sign is subtle, it can sometimes help to distinguish streptococcal tonsillitis from other viral sore throats, where a cough is more common

These symptoms may occur individually or in combination, vary in intensity and come and go in episodes depending on individual susceptibility and triggering factors.

In adults, strep throat left without treatment can prolong discomfort, with a persistent sore throat, more marked tiredness or lasting inflammation. These symptoms can continue for several days and disrupt daily life.

In children and young adults, certain complications, such as those seen in acute rheumatic fever, are reported more often, though they remain rare in many countries.

Generally speaking, a persistent sore throat, or one accompanied by a fever, warrants a prompt consultation. This is the best way to receive reliable and personalised care. Only a healthcare professional is able to make a diagnosis and recommend appropriate treatment.

In a medical setting, the diagnosis is based on a clinical examination, and can be supplemented, if necessary, by a rapid streptococcal test. This test allows doctors to quickly determine whether the bacteria are present in the throat and to guide treatment.

The course of treatment then depends on the individual’s circumstances. A doctor can prescribe an appropriate treatment and recommend measures to relieve the discomfort.

While not claiming to have any therapeutic effect, certain simple habits can help reduce the risk of infection and keep your throat feeling comfortable on a day-to-day basis.

1. Wash Your Hands Regularly: An essential step in limiting the spread of bacteria, particularly after coughing or sneezing or before eating

2. Avoid Sharing Personal Items: Cutlery, glasses, and toothbrushes can easily transmit streptococci from one person to another

3. Ventilate Living Spaces: Refreshing the indoor air helps to reduce the concentration of microbes in the environment

4. Look After Your Lifestyle: Getting enough sleep, eating a varied diet, and staying well-hydrated support the body’s natural defences

5. Keep Warm in Cold Weather or When Temperatures Fluctuate: Protecting your throat and nose helps to limit irritation that weakens the mucous membranes

Teaching children good hygiene habits matters. Washing hands properly, and covering the mouth and nose with a disposable tissue when coughing or sneezing, are simple measures that, when practised every day, can help limit the spread of strep A.

The information here is intended to help you understand strep throat better, but it isn't a substitute for a medical consultation. It's best not to self-medicate, and to follow the advice of your healthcare professional carefully.

Keeping the air in your home from getting too dry can help keep your throat comfortable. In winter, central heating dries the air, which may leave the mucous membranes in the throat more vulnerable to irritants. Using a humidifier, or placing a bowl of water near a radiator, can help add moisture to the air. Alongside regular hydration through the day, this can help keep the throat more comfortable and less irritated.

A naturopath since 2020 and a wellness massage practitioner, Olivia supports those who wish to regain a lasting sense of balance, naturally. Her approach is both professional and deeply human. For her, writing is a way of combining education and sharing, with simplicity and sincerity. Through her articles, she offers simple, practical and accessible advice, based on a holistic view of health.