Medical disclaimer: This page is for general patient education. It is not a substitute for in-person clinical assessment. If you or a family member is severely breathless, has chest pain, or is coughing up blood, seek emergency care immediately.
Fluid Around the Lungs: Causes, Diagnosis, and Treatment in Hyderabad
Breathing that worsens day by day, a heaviness in the chest, and a dry cough that will not stop. These are the symptoms many patients describe when fluid has built up around the lungs. The medical name for this is pleural effusion, and it is one of the most common reasons patients are referred to an interventional pulmonologist in Hyderabad.
The fear is understandable. Most patients are told about the fluid after a chest X-ray or a CT scan, often without much explanation of what it means or what happens next. The reassurance is this: pleural effusion is treatable. With the right procedure, most patients feel significantly better within hours of their first drainage.
This page explains what pleural effusion is, what causes it, and how it is treated, from the first drainage through to long-term management for recurrent or cancer-related fluid.
Written by Dr. Kunal Waghray, MD DM DNB MNAMS EDRM, Interventional Pulmonologist, Respire Airway Clinics, Hyderabad. Published 11 May 2026.
What Is Pleural Effusion?
Pleural effusion is fluid in the space surrounding the lungs. A small amount of fluid is normal and acts as a lubricant. When too much fluid collects, the lung cannot expand fully, and breathing becomes difficult.
What is the pleural space?
Each lung sits inside a thin double-layered lining called the pleura. The narrow gap between the two layers is the pleural space. In a healthy adult, this space holds only a few millilitres of fluid. When disease causes fluid to accumulate, that gap can hold a litre or more.
How much fluid is too much?
Even 300 to 500 millilitres can begin to cause breathlessness, especially in patients with underlying heart or lung disease. Larger effusions, sometimes two litres or more, can compress the lung so severely that the patient cannot lie flat. The exact threshold varies from person to person.
What Causes Fluid Around the Lungs?
Pleural effusion is not a disease in itself. It is a sign that something else is going on, either in the chest or elsewhere in the body. In India, the leading causes are different from those in Western countries, and tuberculosis features prominently.
| Cause | Key feature |
|---|---|
| Heart failure | Often both sides; fluid is clear and protein-poor |
| Tuberculosis | Common in India; typically one-sided; lymphocyte-rich fluid |
| Pneumonia / chest infection | Fluid next to an infection area; can turn to pus (empyema) |
| Cancer (lung, breast, lymphoma) | May recur after drainage; fluid often blood-stained |
| Liver disease (cirrhosis) | Usually right-sided; linked to fluid in the abdomen |
| Kidney disease | Fluid overload; often both sides |
| Autoimmune (rheumatoid, lupus) | Less common; diagnosed by fluid analysis and blood tests |
In Indian clinical practice, tuberculosis and malignancy together account for a very large share of exudative (protein-rich) pleural effusions, with cardiac failure dominating the transudative (protein-poor) group. The cause must be confirmed in every patient, because treatment depends entirely on it.
Is pleural effusion always a sign of cancer?
No. Many patients ask this first, and it is an important question to answer plainly. Cancer is one cause among several. Cardiac failure and tuberculosis are at least as common in Hyderabad. A CT report that mentions “pleural effusion” or even “bilateral pleural effusion” is not, by itself, a cancer diagnosis. The cause is established only after the fluid is drained and analysed.
How Is Pleural Effusion Diagnosed?
Diagnosis happens in two stages. First, we confirm there is fluid and assess how much. Then we find out why it is there.
Clinical examination and chest X-ray
A focused chest examination can suggest an effusion within a few minutes. A standard chest X-ray confirms it in most cases and shows roughly how large it is. Smaller effusions may be missed on X-ray, which is why imaging is often combined with ultrasound.
Ultrasound and CT scan
Bedside ultrasound has become the standard of care for assessing pleural effusion. It shows the fluid in real time, identifies the safest point for drainage, and helps detect whether the fluid is loculated (trapped in pockets). A CT scan of the chest is often added when the cause is unclear or when there is concern about an underlying lung or pleural lesion.
What the fluid analysis tells us, and why diagnosis matters
The single most important diagnostic step is sending a sample of the fluid to the laboratory. The fluid is tested for protein, glucose, cell count, microbiology (including TB), cytology (cancer cells), and biochemical markers such as adenosine deaminase (ADA), which is particularly useful for tuberculous effusion in our setting.
In our practice, many patients who come in struggling to breathe due to pleural effusion feel significant relief within hours of their thoracentesis. The diagnostic information from the fluid analysis then guides everything that comes next, whether that is anti-tuberculosis treatment, heart failure optimisation, antibiotics, or oncology referral.
Thoracentesis: Draining the Fluid
Thoracentesis is the first-line treatment for symptomatic pleural effusion. It is also the most important diagnostic test, because it provides the fluid sample.
Thoracentesis, sometimes called a pleural tap, is a needle procedure to drain the fluid from the pleural space. At Respire Airway Clinics, every thoracentesis is performed under ultrasound guidance. Evidence consistently shows that ultrasound-guided thoracentesis lowers the risk of complications such as pneumothorax, compared with the older landmark-based technique.
What happens during thoracentesis?
You sit upright, usually leaning forward over a pillow on a table. The skin on the back of the chest is cleaned, and a small amount of local anaesthetic is injected to numb the area. Once the area is numb, a thin needle or soft catheter is passed between the ribs and into the pleural space. The fluid drains slowly into a collection bag. A typical thoracentesis takes 20 to 40 minutes from start to finish.
Is thoracentesis painful?
This is the most common question we are asked, and the honest answer is reassuring. Patients usually feel the initial injection of local anaesthetic as a brief sting. After that, the procedure is described as pressure rather than pain. Many patients are surprised at how comfortable it is.
How quickly will I feel better?
Most patients notice easier breathing within minutes of fluid being removed. By the time they sit up after the procedure, the relief is often striking. The improvement is most dramatic in patients who were unable to lie flat or who needed oxygen to manage at home.
Can I go home the same day?
Yes, in most cases. A follow-up chest X-ray or ultrasound is performed after the procedure to confirm the lung has re-expanded and there is no complication. Most patients are discharged a few hours later, with clear instructions on what to watch for at home.
What If the Fluid Keeps Coming Back?
For some patients, the effusion returns after drainage, particularly when the underlying cause is cancer. This is one of the most distressing parts of the journey, because it can feel as though the problem is not being solved. It is being solved, but the strategy has to change.
When is a single thoracentesis not enough?
A single drainage works well when the underlying cause is reversible, for example tuberculosis (treated with anti-TB medication), pneumonia (treated with antibiotics), or cardiac failure (treated with diuretics and heart medication). Once the underlying problem improves, the fluid often does not return.
Recurrent effusion is most common with malignant pleural effusion, where the cancer continues to produce fluid faster than the body can absorb it. In these patients, repeated thoracentesis alone is exhausting and disruptive. A longer-term plan is needed.
Options for recurrent pleural effusion
Repeat thoracentesis
When episodes are infrequent and the patient prefers a simple approach.
Pleurodesis
A procedure to seal the pleural space to prevent fluid returning. Sterile talc is the most widely used agent.
Indwelling pleural catheter (IPC)
A small tube left in place so fluid can be drained at home, without repeated hospital visits.
International guidelines, including those from the British Thoracic Society, recommend that patients with malignant pleural effusion be offered a choice between pleurodesis and an indwelling pleural catheter as first-line long-term management, with the decision individualised to the patient.
Medical Thoracoscopy: When We Need to Look Inside the Pleural Space
If the cause of your pleural effusion is unknown after the first drainage and fluid analysis, medical thoracoscopy allows us to examine the pleural lining directly and take a biopsy.
What is medical thoracoscopy?
Also called pleuroscopy, medical thoracoscopy is performed by an interventional pulmonologist. Under sedation and local anaesthetic, a thin camera is passed into the pleural space through a small incision between the ribs. The pleural lining is inspected, abnormal areas are biopsied, and any remaining fluid is drained. If pleurodesis is planned, talc can be applied during the same procedure.
How is it different from thoracentesis?
Thoracentesis uses a needle to drain fluid. Medical thoracoscopy uses a camera to look directly at the pleura and take tissue samples. Thoracoscopy is reserved for cases where the cause remains unclear, particularly when tuberculosis or pleural malignancy is suspected but cannot be confirmed on fluid testing alone.
Indwelling Pleural Catheter (IPC): Draining Fluid at Home
For patients with malignant pleural effusion who need regular drainage, an indwelling pleural catheter (IPC) removes the need for repeated hospital visits.
How does an IPC work?
The IPC is a soft, thin tube placed into the pleural space through a small incision, usually as a day-case procedure. Most of the tube sits inside the chest. The end remains under the skin, with a valve that opens only when a drainage bottle is connected. Patients, or a family member, or a visiting nurse, drain the fluid into a vacuum bottle at home, often two or three times a week. The procedure to insert the catheter takes about 30 to 45 minutes.
Who is suitable for an IPC?
- The cause of the effusion is known (most often cancer)
- The fluid keeps returning after thoracentesis
- The patient prefers to avoid repeated hospital admissions
- The lung does not fully re-expand after drainage (non-expandable or trapped lung), where pleurodesis is less likely to succeed
The catheter can stay in place for months. In some patients, the pleural space gradually seals on its own around the catheter, and it can be removed.
When to See an Interventional Pulmonologist
Speak with a specialist if any of the following apply:
- A chest X-ray or CT scan has reported "pleural effusion" or "fluid in the chest"
- Your breathlessness is worsening over days or weeks
- You have been told the fluid is related to cancer, tuberculosis, or an infection
- Fluid has been drained before, and it has come back
- You were advised "watchful waiting" but symptoms have not settled
An interventional pulmonologist in Hyderabad is trained specifically in pleural procedures, from ultrasound-guided thoracentesis to medical thoracoscopy and IPC placement. If you would like to read about related airway diagnostics, our page on what is bronchoscopy covers a procedure that is often performed alongside pleural assessment.
Some effusions resolve completely once the underlying condition is treated. Others need ongoing care. The right plan depends on the cause, the response to first drainage, and your own preferences. That conversation is best had in clinic, after the fluid has been drained and analysed.
Frequently Asked Questions
How long does a thoracentesis take?
The procedure itself takes about 20 to 40 minutes, depending on how much fluid is drained. With preparation, ultrasound assessment, and a post-procedure check, the total visit is usually two to three hours.
How much fluid can be drained in one session?
Up to about 1.5 litres is removed in a single session in most cases. Draining too much fluid too quickly can cause a cough or chest discomfort as the lung re-expands. If a larger volume is present, a second session may be planned.
Will my pleural effusion come back?
It depends on the cause. Effusions due to pneumonia, tuberculosis, or controlled heart failure often do not return once the underlying condition is treated. Malignant effusions are more likely to recur, and longer-term options such as an indwelling pleural catheter or pleurodesis are discussed in those cases.
Is pleural effusion always serious?
A pleural effusion is always worth investigating, but it is not always dangerous. Some are caused by easily treatable conditions. Severity depends on the cause, the volume of fluid, and how much it affects breathing. That is why fluid analysis matters.
Is the draining procedure painful?
Most patients describe a brief sting from the local anaesthetic injection, then pressure rather than pain during the drainage itself. Discomfort is usually mild and short-lived.
Does insurance cover thoracentesis in India?
Most Indian health insurance policies cover thoracentesis and related pleural procedures when they are medically indicated, including as day-care procedures. Coverage details vary by policy. Our team can help you confirm with your insurer before the appointment.
My CT shows bilateral pleural effusion — is this serious?
Bilateral simply means fluid is present on both sides. It does not automatically mean cancer. Bilateral effusions are commonly seen in heart failure, kidney disease, and certain autoimmune conditions. The cause is established with fluid analysis and clinical assessment, not from the CT report alone.
Book a Pleural Effusion Consultation
If you or a family member has been told there is fluid around the lungs, or if breathlessness has been worsening and an effusion has been found on imaging, contact Respire Airway Clinics. Dr. Kunal Waghray performs thoracentesis and all pleural procedures on a dedicated schedule, with fluid results discussed the same day.