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COVID-19 Complications and Their Effects

Learn about COVID-19 complications and their effects on the lungs, heart, brain, and other organs. Understand long-term risks and when to seek medical attention for persistent symptoms.

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Written by Dr. J T Hema Pratima

Reviewed by Dr. Md Yusuf Shareef MBBS

Last updated on 18th Aug, 2025

The COVID-19 pandemic has affected millions of people worldwide, and while many recover fully, some experience lingering or severe complications. If you or a loved one has had COVID-19, it’s important to understand the possible long-term effects and how to manage them. This article will guide you through common complications, their impact on health, and ways to recover effectively.

What Are COVID-19 Complications?

COVID-19 is primarily a respiratory illness caused by the SARS-CoV-2 virus. While some people have mild or no symptoms, others develop severe infections leading to complications. These complications can affect different organs and persist even after recovery, a condition often called "Long COVID" or "Post-COVID Syndrome."

Common COVID-19 Complications

Here are some common COVID-19 complications:

1. Respiratory Problems

COVID-19 primarily affects the lungs, leading to:

  • Pneumonia: Inflammation in the lungs causing breathing difficulties.

  • Acute Respiratory Distress Syndrome (ARDS): A severe lung condition requiring oxygen support or ventilation.

  • Lung Scarring (Fibrosis): Long-term damage making breathing difficult.

Symptoms: Shortness of breath, persistent cough, chest pain.

2. Heart-Related Issues

COVID-19 can cause inflammation in the heart (myocarditis), blood clots, or irregular heartbeats, increasing the risk of:

  • Heart attacks

  • Heart failure

  • High blood pressure

Symptoms: Chest pain, palpitations, fatigue, swelling in legs.

3. Neurological Effects

Some patients report brain-related complications, such as:

  • Brain fog: Difficulty concentrating or remembering things.

  • Headaches & dizziness

  • Loss of smell or taste (which may take months to return)

  • Stroke or nerve damage (in severe cases)

4. Fatigue & Weakness (Post-COVID Fatigue)

Many people experience extreme tiredness, muscle weakness, and difficulty performing daily activities even after recovery.

5. Mental Health Impact

The stress of illness, isolation, and fear can lead to:

  • Anxiety

  • Depression

  • Sleep disorders

6. Digestive Problems

Some patients report:

  • Diarrhoea

  • Loss of appetite

  • Stomach pain

7. Kidney & Liver Damage

Severe COVID-19 can cause organ dysfunction, leading to long-term kidney or liver issues.

8. Blood Clotting Disorders

COVID-19 increases the risk of blood clots, which can lead to:

  • Deep Vein Thrombosis (DVT)

  • Pulmonary embolism (lung clots)

Who Is at Higher Risk of Complications?

Certain groups are more vulnerable to severe COVID-19 effects:

  • Elderly individuals (above 60)

  • People with pre-existing conditions (diabetes, heart disease, lung disease, obesity)

  • Those with weakened immune systems (cancer patients, HIV, transplant recipients)

  • Smokers

Consult Top Specialists

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

450

Dr. Swagata Sircar, General Physician/ Internal Medicine Specialist

Dr. Swagata Sircar

General Physician/ Internal Medicine Specialist

8 Years • MBBS, MD General Medicine

Kolkata

HealthYou Speciality Clinic & Diagnostics., Kolkata

600

600

Dr. Harshendra Jaiswal, General Physician/ Internal Medicine Specialist

Dr. Harshendra Jaiswal

General Physician/ Internal Medicine Specialist

12 Years • MBBS , MD (General medicine)

Kolkata

108 DHANA DHANVANTARI Clinic, Kolkata

recommendation

85%

(25+ Patients)

600

500

Dr. Divyashree K, General Physician/ Internal Medicine Specialist

Dr. Divyashree K

General Physician/ Internal Medicine Specialist

5 Years • MBBS

Bengaluru

Apollo Clinic, JP nagar, Bengaluru

500

IMAGE
Dr. Chaithra H, General Physician/ Internal Medicine Specialist

Dr. Chaithra H

General Physician/ Internal Medicine Specialist

6 Years • MBBS, MD General Medicine, DNB General Medicine

Bangalore

Apollo 24|7 Clinic - Karnataka, Bangalore

750

Managing COVID-19 Complications

If you’re recovering from COVID-19 and experiencing lingering symptoms, here are some ways to improve your health:

1. Breathing Exercises & Pulmonary Rehabilitation

  • Practice deep breathing exercises to strengthen lung function.

  • Use a spirometer (a device to improve lung capacity).

  • Consult a physiotherapist if needed.

2. Gradual Physical Activity

  • Start with light walks and slowly increase activity.

  • Avoid overexertion if you feel fatigued.

3. Healthy Diet & Hydration

  • Eat protein-rich foods (eggs, lentils, lean meats) for muscle recovery.

  • Include fruits and vegetables for immunity.

  • Stay hydrated to help flush out toxins.

4. Mental Health Support

  • Talk to a counsellor if feeling anxious or depressed.

  • Practice relaxation techniques (meditation, yoga).

  • Stay connected with family and friends.

5. Regular Medical Check-ups

  • Monitor blood pressure, sugar levels, and oxygen saturation.

  • Get follow-up tests if recommended by your doctor.

6. Vaccination & Booster Doses

  • Stay updated with COVID-19 vaccines to reduce reinfection risks.

When to See a Doctor?

Consult a healthcare provider if you experience:

  • Severe shortness of breath

  • Chest pain or irregular heartbeat

  • Confusion or memory problems

  • Persistent fatigue affecting daily life

How Apollo 24|7 Can Help?

If you or a loved one is dealing with post-COVID complications, Apollo 24|7 offers:

  • Expert consultations with pulmonologists, cardiologists, and neurologists.

  • Diagnostic tests (lung function tests, heart scans, blood work).

  • Rehabilitation programs for recovery.

You can easily book an online consultation or schedule tests through the Apollo 24|7 app or website.

Conclusion

Recovering from COVID-19 can take time, and some complications may linger. However, with proper care, a healthy lifestyle, and medical support, most people can regain their strength. Listen to your body, stay patient, and seek help when needed.

Consult Top Specialists

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

450

Dr. Swagata Sircar, General Physician/ Internal Medicine Specialist

Dr. Swagata Sircar

General Physician/ Internal Medicine Specialist

8 Years • MBBS, MD General Medicine

Kolkata

HealthYou Speciality Clinic & Diagnostics., Kolkata

600

600

Dr. Harshendra Jaiswal, General Physician/ Internal Medicine Specialist

Dr. Harshendra Jaiswal

General Physician/ Internal Medicine Specialist

12 Years • MBBS , MD (General medicine)

Kolkata

108 DHANA DHANVANTARI Clinic, Kolkata

recommendation

85%

(25+ Patients)

600

500

Dr. Divyashree K, General Physician/ Internal Medicine Specialist

Dr. Divyashree K

General Physician/ Internal Medicine Specialist

5 Years • MBBS

Bengaluru

Apollo Clinic, JP nagar, Bengaluru

500

IMAGE
Dr. Chaithra H, General Physician/ Internal Medicine Specialist

Dr. Chaithra H

General Physician/ Internal Medicine Specialist

6 Years • MBBS, MD General Medicine, DNB General Medicine

Bangalore

Apollo 24|7 Clinic - Karnataka, Bangalore

750

Consult Top Specialists

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

450

Dr. Swagata Sircar, General Physician/ Internal Medicine Specialist

Dr. Swagata Sircar

General Physician/ Internal Medicine Specialist

8 Years • MBBS, MD General Medicine

Kolkata

HealthYou Speciality Clinic & Diagnostics., Kolkata

600

600

Dr. Harshendra Jaiswal, General Physician/ Internal Medicine Specialist

Dr. Harshendra Jaiswal

General Physician/ Internal Medicine Specialist

12 Years • MBBS , MD (General medicine)

Kolkata

108 DHANA DHANVANTARI Clinic, Kolkata

recommendation

85%

(25+ Patients)

600

500

Dr. Divyashree K, General Physician/ Internal Medicine Specialist

Dr. Divyashree K

General Physician/ Internal Medicine Specialist

5 Years • MBBS

Bengaluru

Apollo Clinic, JP nagar, Bengaluru

500

IMAGE
Dr. Chaithra H, General Physician/ Internal Medicine Specialist

Dr. Chaithra H

General Physician/ Internal Medicine Specialist

6 Years • MBBS, MD General Medicine, DNB General Medicine

Bangalore

Apollo 24|7 Clinic - Karnataka, Bangalore

750

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