Swallowing, Chest Infection and Breathing Risks After Stroke

Why the chest is at risk after a stroke

Swallowing looks simple, but it's one of the most finely timed things the body does. In under a second, the tongue pushes food back, the voice box lifts, a small flap closes over the airway, and breathing pauses. A stroke can slow or weaken any step. When that happens, a little food, drink or saliva can slip into the windpipe instead of the food pipe. Doctors call this aspiration.

Normally a strong cough clears it. After a stroke, the cough may be weak, the throat may be less sensitive, and the person may be lying down much of the day, which lets secretions pool in the lower parts of the lungs. Put those together and you have the main reason chest infection after stroke is one of the more serious early complications. Some people aspirate without coughing at all (silent aspiration), so the absence of coughing doesn't prove the swallow is safe. Our page on the wider list of stroke complications shows where this fits among the others.

Signs the swallow may not be safe

Hospitals usually screen swallowing before the first meal, and a speech and swallowing therapist may advise on food textures. At home, families are the ones who see every meal, so these are worth watching for:

• Coughing, throat clearing or choking during or just after eating or drinking
• A wet, gurgly voice after a sip of water
• Food left pocketed in the cheek on the weak side
• Meals taking much longer than before, or the person tiring halfway through
• Drooling, or liquid leaking from the mouth
• Repeated low-grade fevers or a chest that sounds rattly

If you notice these, tell the doctor. Texture changes, thickened fluids or a feeding tube are medical and swallowing-therapist decisions, not things to try on your own. Weakness of the lips and cheek also plays a part, and the facial exercises guide explains what can be done for that side of the face.

Positioning for meals, and after them

Position is the single most practical thing a family controls. The person should be sitting fully upright for every meal, ideally in a chair at a table. If they must eat in bed, raise the head end as high as it goes and use pillows to stop them sliding down and slumping; a slumped position with the chin poking up opens the airway. Keep the head level or slightly forward, as the therapist advises.

Small mouthfuls, slow pace, no talking with food in the mouth, and no television drawing the head sideways. Feed from the front or slightly on the stronger side, at eye level, not from above. Afterwards, stay upright for at least half an hour, longer if the doctor advises, because reflux and leftover food can still be inhaled when someone lies flat straight after eating. Our bed positioning guide shows safe propped positions for rest periods.

Patients fed through a nasal tube (Ryle's tube) still need the head raised during and after feeds. A tube reduces the risk from food in the mouth, but saliva and reflux can still reach the lungs.

Mouth care is chest care

This surprises many families. The mouth of someone who isn't eating normally, or who has a weak side, builds up bacteria quickly. If saliva carrying those bacteria is aspirated, it's more likely to cause infection. Brushing teeth or dentures twice a day, cleaning the gums and tongue, and checking for food pockets on the weak side are simple steps that help protect the lungs. Patients on tube feeds need mouth care just as much as those eating by mouth.

Spotting a chest infection after stroke early

In older stroke patients, a chest infection doesn't always look like a chest infection. There may be no dramatic cough. Families more often notice that the person is suddenly drowsy, confused, off their food, or weaker than yesterday. Other signs include fever or chills, faster breathing, a new or wetter cough, coloured phlegm, and breathlessness at rest.

If you have a home pulse oximeter, a reading that is lower than the person's usual one is worth reporting, but don't rely on the number alone. Call the doctor the same day for any of these. Treatment is medical, and early treatment is easier than late.

Chest physiotherapy and breathing exercises

Physiotherapy can't treat an infection, but it plays a real part in preventing one and in clearing the chest during recovery. What we do depends on how alert and mobile the person is, and it's chosen after assessment and checked with the doctor when there's an active infection.

Getting upright and moving is the most effective breathing treatment there is. Sitting out of bed lets the lungs expand properly, and every short walk makes the person breathe more deeply. Deep breathing with a short hold at the top opens the lower lungs. Assisted coughing helps when the cough is weak: we support the abdomen or chest wall at the right moment to make the cough more effective. For people with more secretions, positioning and gentle manual techniques can help move phlegm towards the larger airways where it can be cleared. Some patients benefit from an incentive spirometer as a visual target.

Families can learn the simpler parts, and the breathing and respiratory exercises page describes several of them. Through home physiotherapy for stroke patients, we teach these at the bedside so they become part of the daily routine rather than something done only when the physio visits.

When risk is highest

People with a larger stroke, reduced alertness, a weak cough, difficulty sitting up, or who spend most of the day in bed carry the greatest risk. So do those with existing lung disease or who smoked. For them, the routine of upright meals, mouth care, regular repositioning and breathing work matters every single day. Our guide on recovery after a severe stroke covers the wider care picture, and home nursing for stroke patients can help with feeding, mouth care and turning when the family needs support. The caregiver guide brings these daily tasks together, and the stroke recovery overview explains how they fit into the longer journey.

Frequently asked questions