lung on one side

Overview

"Lung on one side" means a health problem that affects only one of your lungs. This can include a collapsed lung (pneumothorax), fluid around the lung (pleural effusion), or an infection like pneumonia. The other lung may still work normally.

Problems affecting one lung are not rare. For example, pneumothorax (collapsed lung) happens in about 7 to 18 people out of every 100,000 each year. Pleural effusion is also common, especially in people with heart failure or infection.

It can affect people of all ages, from newborns to older adults. Some conditions are more likely in tall, thin young people (pneumothorax) or in people with chronic lung diseases like COPD. Injuries and infections can happen to anyone.

Symptoms

Common symptoms

• Sharp or stabbing chest pain on one side, often worse when breathing deeply or coughing
• Shortness of breath, especially with activity
• Dry or productive cough
• Rapid breathing or feeling like you cannot get enough air

Symptoms in children

• Irritability or fussiness
• Difficulty feeding or refusal to eat
• Grunting or flaring nostrils when breathing
• Fever and cough

Symptoms in older adults

• Confusion or drowsiness
• Fatigue and weakness
• Loss of appetite
• Low oxygen levels (measured by a pulse oximeter)

Causes

Main causes

• Infection (such as pneumonia or tuberculosis) that inflames one lung
• Air leaking into the space around the lung (pneumothorax), often from injury or a burst blister on the lung
• Fluid building up around the lung (pleural effusion) due to heart failure, infection, or cancer
• Blood clot in the lung (pulmonary embolism) that blocks blood flow to part of the lung

Risk factors

• Smoking or exposure to second-hand smoke
• Chronic lung diseases like asthma, COPD, or cystic fibrosis
• Recent chest injury or surgery
• Deep vein thrombosis or clotting disorders
• Weak immune system (from HIV, cancer treatment, or long-term steroid use)

When to see a doctor

See a doctor urgently if:

• Call your local emergency number or go to the emergency department if you have sudden severe chest pain, difficulty breathing, or blue lips.
• Seek urgent care if you cough up blood or feel faint.

Book a routine appointment if:

• Make an appointment with your doctor if you have a persistent cough, fever, or mild chest discomfort that lasts more than a few days.
• See your doctor if you have a known lung condition and your symptoms are getting worse.

Diagnosis

Your doctor will ask about your symptoms and medical history, listen to your lungs with a stethoscope, and order tests to see inside your chest.

Tests that may be done

• Chest X-ray – a quick picture to check for air or fluid in the chest
• CT scan – a more detailed scan of the lungs and chest
• Blood tests – to look for infection or a blood clot
• Ultrasound – to see fluid around the lung

What to expect at your appointment

You may have to breathe in and out while a technician takes pictures. If fluid or air is found, the doctor may use a needle or tube to drain it. The procedure is usually done with numbing medicine so you stay comfortable.

Treatment

Treatment depends on what is causing the problem. The goal is to remove air or fluid if needed, treat any infection or clot, and help your lung re-expand.

Self-care at home

• Get plenty of rest and avoid heavy lifting or strenuous activity until your doctor says it is safe.
• Do not smoke or vape – this can worsen lung damage and slow healing.
• Use pain relief as recommended by your doctor (such as paracetamol or ibuprofen – but no specific brand names).

Medical treatments

For pneumothorax, doctors may insert a small chest tube to let the air escape and allow the lung to reinflate. For pleural effusion, a needle or tube can drain the fluid. Antibiotics or antiviral medicines are used for infections, and blood thinners for a clot. Oxygen may be given if levels are low. Treatments are tailored to your specific condition.

When is surgery considered?

Surgery may be needed if a collapsed lung keeps happening (recurrent pneumothorax) or if a blood clot cannot be treated with medicine. Procedures like pleurodesis (sticking the lung to the chest wall) or removing part of the lung may be done.

Living with this condition

After treatment, most people can return to normal activities within a few weeks. You may need to avoid flying or scuba diving for a while if you had a collapsed lung. Follow your doctor’s advice on activity levels.

Lifestyle tips

• Quit smoking and avoid second-hand smoke.
• Get vaccinated against flu and pneumococcal pneumonia.
• Stay active with gentle exercise like walking, as tolerated.

Diet and exercise

Eat a balanced diet with plenty of fruits and vegetables to support healing. Light exercise, such as walking, can improve lung function, but avoid heavy lifting until cleared by your doctor.

Mental health and emotional wellbeing

Living with a lung condition can cause anxiety or depression, especially if you worry about breathing. It is normal to feel scared. Talk to your doctor about support options, including counselling or support groups.

Prevention

Not all cases can be prevented, but you can lower your risk. Avoiding smoking, treating lung infections early, and managing chronic conditions can help.

Vaccines

Vaccines for flu and pneumococcal pneumonia can reduce the chance of lung infections. Ask your doctor which vaccines are right for you.

Screening programmes

There is no routine screening for one-sided lung problems. However, if you have risk factors like a family history of lung disease or a personal history of collapsed lung, your doctor may recommend regular check-ups.

Complications

If left untreated

• Respiratory failure (when the lungs cannot get enough oxygen into the blood)
• Spread of infection to the blood (sepsis) or to the other lung
• Chronic lung damage or scarring
• Recurrent collapsed lung

Long-term outlook

With prompt treatment, most people recover fully from a lung problem on one side. Even after a serious collapse or infection, the lung can heal and function well. Ongoing care and healthy habits can help you breathe easier for years to come.

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