Treatment for a collapsed lung (pneumothorax) depends on how much of the lung has deflated and how severe your symptoms are. A small collapse in an otherwise healthy person may only need monitoring, while a large or symptomatic collapse typically requires a procedure to remove trapped air and let the lung re-expand. In the most serious cases, surgery prevents the problem from coming back.
What Happens During a Collapsed Lung
A collapsed lung occurs when air leaks into the space between your lung and your chest wall. This trapped air puts pressure on the lung from the outside, preventing it from fully expanding when you breathe. The result is sudden, sharp chest pain on the affected side and shortness of breath that can range from mild to severe.
There are two main categories. A primary spontaneous pneumothorax happens without an obvious cause, usually in tall, thin young adults. A secondary spontaneous pneumothorax develops as a complication of existing lung disease like COPD or cystic fibrosis, and it tends to be more dangerous because the lungs are already compromised. Traumatic pneumothorax, caused by an injury or medical procedure, is a third category with its own treatment considerations.
Observation for Small, Stable Cases
If the collapse is small and your symptoms are minimal, your doctor may recommend simply watching and waiting. Current European guidelines suggest conservative management for primary spontaneous pneumothorax in selected patients who are clinically stable, regardless of the size of the collapse. This is a meaningful shift from older approaches that based treatment decisions primarily on how large the pneumothorax appeared on imaging.
During observation, you’ll typically receive supplemental oxygen, which can speed up the rate at which your body reabsorbs the trapped air. You’ll stay for monitoring and get follow-up chest X-rays to confirm the lung is re-expanding on its own. If symptoms worsen or the lung isn’t improving, your care team will move to a more active treatment.
Needle Aspiration
For a primary spontaneous pneumothorax that needs intervention, needle aspiration is the recommended first-line treatment over a chest tube. The procedure is straightforward: a doctor inserts a needle or small catheter into the chest cavity and uses a syringe to manually withdraw the trapped air. Once enough air is removed, the lung can re-expand.
Needle aspiration works immediately in roughly 56% of cases, compared to about 71% for chest tubes. That lower success rate might sound like a disadvantage, but aspiration comes with a shorter hospital stay, less pain, and fewer complications. If the first attempt doesn’t fully resolve the collapse, the procedure can be repeated or a chest tube can be placed as a backup. For these reasons, guidelines strongly favor trying aspiration first in otherwise healthy patients.
Chest Tube Drainage
When aspiration isn’t enough, or when a patient is unstable, a chest tube is the next step. This involves placing a tube through the chest wall into the pleural space (the gap between the lung and rib cage). The tube connects to a drainage system that continuously removes air, allowing the lung to re-expand and stay inflated.
Chest tubes come in various sizes. Small tubes and catheters (14 French or smaller) are often sufficient for a straightforward pneumothorax. Moderate tubes (16 to 22 French) handle cases with ongoing air leaks, and larger tubes (up to 36 French) are reserved for complex situations. The trend in recent years has been toward smaller tubes, which are less painful and equally effective for most patients.
The tube typically stays in place until the air leak seals and imaging confirms the lung has fully re-expanded, which can take anywhere from a couple of days to over a week. Pain management during this time often includes local anesthesia at the insertion site and regional nerve blocks that provide longer-lasting relief than local numbing alone.
Outpatient Treatment With Portable Devices
Not everyone with a chest tube needs to stay in the hospital. Ambulatory devices, which are small, portable one-way valves attached to a compact drainage system, allow some patients to go home and return for follow-up visits. Recent trials have shown these devices to be as effective as conventional inpatient management for primary spontaneous pneumothorax.
Guidelines support ambulatory management for primary cases at centers with the right expertise and follow-up pathways. For secondary spontaneous pneumothorax, however, guidelines recommend against using small portable devices because the underlying lung disease makes outpatient management riskier.
Emergency Treatment for Tension Pneumothorax
A tension pneumothorax is a life-threatening emergency where trapped air builds up under increasing pressure, compressing the heart and major blood vessels. It requires immediate needle decompression before any imaging is done. A large-bore needle is inserted into the chest to release the pressure, followed by a chest tube.
The traditional insertion site has been the second intercostal space at the mid-clavicular line (just below the collarbone on the affected side), but this approach has a high failure rate in patients with thicker chest walls. Many emergency protocols now favor the fourth or fifth intercostal space along the anterior axillary line (roughly at the side of the chest near the armpit), which has lower failure rates.
Surgery to Prevent Recurrence
A collapsed lung has a high chance of happening again. The pooled one-year recurrence rate for primary spontaneous pneumothorax is about 29%, and the overall recurrence rate across all follow-up periods is roughly 32%. With conservative treatment alone, recurrence rates can reach as high as 20% to 60% depending on the study.
Surgery dramatically reduces that risk. The most common approach is video-assisted thoracoscopic surgery (VATS), a minimally invasive procedure done through small incisions. The surgeon identifies and repairs the air leak, usually by removing small blebs or blisters on the lung surface that caused the leak in the first place. A procedure called pleurodesis is often performed at the same time: the surgeon introduces a substance like sterile talc into the pleural space, which triggers inflammation that causes the lung surface to adhere to the chest wall. This seal makes it much harder for air to accumulate there again.
After VATS, the pooled recurrence rate drops to around 10%, with some analyses placing the adjusted rate closer to 16%. That’s a substantial improvement over nonsurgical management. Current guidelines suggest considering early surgical intervention for patients with primary spontaneous pneumothorax who prioritize preventing recurrence, even after a first episode.
The typical indications for surgery include a second pneumothorax on the same side, a persistent air leak that won’t seal after several days of chest tube drainage, or bilateral pneumothorax (both lungs affected). Certain occupations, like commercial pilots or divers, may also warrant earlier surgical intervention because recurrence in those settings could be especially dangerous.
Recovery Timeline and Restrictions
Recovery after a simple aspiration or short chest tube placement generally takes one to two weeks before you feel close to normal, though full healing of the pleural lining takes longer. After surgery, most people return to light daily activities within a few weeks, with full recovery over four to six weeks.
Air travel is restricted after a collapsed lung. You should not fly until at least seven days after a chest X-ray confirms full resolution. The lower cabin pressure at altitude can cause any residual trapped air to expand, potentially triggering a re-collapse. Scuba diving carries an even greater risk due to the extreme pressure changes involved, and many physicians advise against diving permanently after a spontaneous pneumothorax unless surgery has been performed and lung function is confirmed normal.
Heavy lifting, intense exercise, and activities that involve straining or holding your breath should be avoided during recovery. Your doctor will use follow-up imaging to confirm healing before clearing you to resume strenuous activity.