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Published on: May 04, 2022
2 minute read
By: Second Medic Expert

Lung Cancer Causes, Symptoms, Diagnosis & Treatment

What Causes Lung Cancer?

There is no one answer to this question as lung cancer can be caused by a variety of things, including exposure to tobacco smoke, radon gas, asbestos fibers, and secondhand smoke. However, the most common cause of lung cancer is smoking cigarettes. In fact, smoking is responsible for about 85% of all lung cancer cases in the United States.

Symptoms of Lung Cancer

Lung cancer symptoms can differ depending on how advanced the disease is. In its early stages, lung cancer may not cause any symptoms at all. As it progresses, however, you may start to experience cough (with or without blood), chest pain, shortness of breath, trouble swallowing,

Lung cancer is the leading cause of cancer death in men and women in the United States. Smoking cigarettes is the main risk factor for developing lung cancer, but studies have shown that people who have never smoked cigarettes can also get lung cancer. The second leading cause of lung cancer is long-term exposure to radon gas. There are two main types of lung cancer, small cell lung carcinoma (SCLC) and non-small cell lung carcinoma (NSCLC). The type of lung cancer you have will play a role in what treatment options are available to you.

Cigarette smoking is responsible for approximately 85% of all lung cancers. Lung cancer symptoms can be hard to identify in the early stages of the disease. Many times, people don’t experience any symptoms until the cancer has spread. When present, common symptoms of lung cancer include:

-A cough that doesn’t go away or gets worse over time

-Chest pain that is often worse with deep breathiing, coughing or laughing

-Hoarseness

Approximately 1 out of 3 cancer deaths in the US is caused by lung cancer. The two main types of lung cancer are small cell lung carcinoma (SCLC) and non-small cell lung carcinoma (NSCLC). These two types of lung cancer differ in their histology, etiology, and response to treatment. Lung cancer can be caused by a number of risk factors, including smoking, asbestos exposure, air pollution, and radiation exposure. Smoking is by far the most important risk factor for developing lung cancer; it is estimated that about 90% of all lung cancers are due to smoking cigarettes.

While the exact cause of lung cancer is unknown, it is believed to be caused by a combination of genetic and environmental factors. The most common symptom of lung cancer is a cough that does not go away, but other symptoms may include shortness of breath, chest pain, or weight loss. If you experience any of these symptoms, it’s important to see your doctor right away so that they can rule out other potential causes and begin appropriate treatment.

There are two main types of lung cancer: non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC). NSCLC makes up around 85% of all lung cancers, while SCLC accounts for the remaining 15%. The two types differ in their cells' structure and how they grow.

Lung cancer symptoms can include a cough that does not go away, shortness of breath, chest pain, hoarseness, weight loss, and fatigue. Lung cancer is the leading cause of cancer-related deaths worldwide, and it is estimated that 1 in 8 men and 1 in 9 women will develop lung cancer in their lifetime. There are two main types of lung cancer: small cell lung cancer (SCLC) and non-small cell lung cancer (NSCLC). The most common symptom of lung cancer is a cough that does not go away, and other symptoms include shortness of breath, chest pain, hoarseness, weight loss, and fatigue.

Lung cancer causes more deaths than the next three most common cancers combined (colorectal, breast, and pancreatic). Smoking is by far the most important risk factor for lungcancer. Tobacco smoking is estimated to be responsible for 87% of lung cancer cases in men and 70% in women. The risk of developing lung cancer increases with the number of cigarettes smoked per day and the duration of smoking. Cigarette smokers have about 20 times the risk of developing lung cancer as compared to non-smokers.

Symptoms of lung cancer include coughing up blood, difficulty breathing, and persistent pain in the chest or shoulder. If you experience any of these symptoms, it's important to see a doctor right away. A diagnosis can be made through a combination of imaging tests (X-ray, CT scan, PET scan) and biopsies (removing tissue to examine under a microscope). Treatment options for lung cancer depend on the stage of the disease and can include surgery, chemotherapy, radiation therapy, or targeted therapy.

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Fever for 3 Days ? Should You Visit a Doctor or Wait

A fever lasting three days raises valid concern for patients and caregivers alike. While many febrile episodes resolve independently, a persistent fever lasting 72 hours warrants careful evaluation. Understanding when to seek medical attention and when watchful waiting is appropriate can prevent unnecessary complications and guide timely clinical intervention.

Should You Visit a Doctor If Fever Lasts for 3 Days?

A fever persisting for three consecutive days in adults generally requires medical evaluation, particularly when body temperature exceeds 103°F (39.4°C) or when additional symptoms such as breathlessness, severe headache, or rash are present. In children under five years, medical consultation is recommended after 48 to 72 hours of unresolved fever regardless of severity. Physicians advise against self-managing a three-day fever without professional assessment in high-risk populations.

Clinically, a three-day fever threshold is significant because most viral infections producing fever resolve within 48 to 72 hours. Fever persisting beyond this window may indicate a bacterial infection, an underlying inflammatory condition, or a secondary complication requiring targeted diagnostic workup. In the Indian clinical context, endemic infections such as dengue, typhoid, and malaria must be considered as potential etiologies when fever extends beyond 72 hours.

Common Causes of Persistent Fever in Adults and Children

Persistent fever lasting three or more days may originate from a range of infectious and non-infectious etiologies. Identifying the underlying cause is essential for selecting appropriate treatment.

Infectious Causes:

Viral infections: Influenza, dengue fever, chikungunya, COVID-19
Bacterial infections: Typhoid fever (enteric fever), urinary tract infections, pneumonia, tuberculosis
Parasitic infections: Malaria (particularly relevant in tropical regions of India)

Non-Infectious Causes:

Autoimmune or inflammatory conditions
Drug-induced fever (fever as an adverse drug reaction)
Post-vaccination fever (typically resolves within 48 hours)

Condition	Typical Fever Duration	Key Associated Symptoms
Viral fever	3 to 5 days	Body ache, fatigue, runny nose
Dengue fever	5 to 7 days	Severe joint pain, rash, low platelet count
Typhoid fever	7 to 14 days	Abdominal pain, diarrhea or constipation, rose spots
Malaria	Cyclical pattern	Chills, sweating, rigors
Urinary tract infection	Variable	Burning urination, flank pain

What to Do When Fever Does Not Go Down After 3 Days

When fever does not subside after 72 hours, the immediate recommended course of action is to consult a general physician or internist for clinical assessment. Antipyretic medications such as paracetamol (acetaminophen) can manage symptom discomfort but do not treat the underlying cause. Blood investigations including a complete blood count (CBC), malarial antigen test, and dengue NS1 antigen test are standard first-line diagnostics in India.

Beyond seeking medical consultation, patients should maintain adequate hydration, rest, and nutritional intake. Oral rehydration is particularly important in a tropical climate where fever accelerates fluid loss. Specialists caution against self-prescribing antibiotics without laboratory confirmation, as indiscriminate antibiotic use contributes to antimicrobial resistance, a significant public health concern in India. Clinical data supports early laboratory testing as the most effective step when fever persists beyond three days.

Warning Signs That Require Immediate Medical Attention

Certain symptoms accompanying a three-day fever indicate medical emergencies requiring immediate hospital evaluation rather than home management.

Patients or caregivers should seek emergency care if any of the following are present:

Fever above 104°F (40°C) that does not respond to antipyretics
Severe headache with neck stiffness (possible meningitis)
Difficulty breathing or chest pain
Skin rash appearing alongside fever (possible dengue or viral exanthem)
Altered consciousness, confusion, or seizures
Persistent vomiting preventing oral hydration
Fever in infants below three months of age
Fever in immunocompromised patients (those on chemotherapy, steroids, or with HIV)
Signs of dehydration: sunken eyes, dry mouth, reduced urine output

In children, febrile seizures can occur at temperatures above 102°F (38.9°C). While often self-limiting, any seizure associated with fever requires urgent pediatric evaluation.

Can a 3-Day Fever Resolve Without Medical Treatment?

In otherwise healthy adults, a mild to moderate fever (below 102°F) lasting three days caused by a self-limiting viral infection can resolve without specific medical treatment. The immune system typically clears common viral pathogens within three to five days. Supportive care including rest, hydration, and antipyretics is sufficient in low-risk cases.

However, resolution without medical treatment is not advisable for children under five, adults above 65, pregnant women, or individuals with chronic conditions such as diabetes or heart disease. Clinical evidence consistently indicates that delayed diagnosis in these populations increases the risk of serious complications. In regions with high prevalence of vector-borne diseases such as dengue and malaria, assuming a self-limiting viral cause without testing carries significant risk. Medical consultation remains the safest and most clinically sound approach when fever persists beyond three days.

Medical Disclaimer

This content is intended for educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Readers experiencing persistent fever or related symptoms should consult a qualified healthcare professional for evaluation and management.

If you are facing similar health concerns, consult expert doctors online through the SecondMedic app or visit your nearest SecondMedic Health Hub for in-person care

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