Evidence-Based Medical Knowledge You Can Trust
Infectious diseases are illnesses caused by bacteria, viruses, fungi, or parasites, spreading through contact, food, water, or vectors.
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. Key Takeaways: EMERGENCY WARNING: If you or a loved one experience high fever, severe shortness of breath, sudden confusion, chest pain, or a widespread rash accompanied by high lethargy, seek immediate emergency medical care or call 911. Call your doctor’s office or emergency room before … Read more
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. Key Takeaways: EMERGENCY WARNING: Seek immediate medical attention if you or a family member experience severe shortness of breath, continuous chest pressure or pain, sudden confusion, bluish lips or face, or a fever that drops and then returns with a worsening cough. These are signs … Read more
Key Takeaways EMERGENCY WARNING: Seek emergency medical care immediately if an adult or child displays warning signs such as severe shortness of breath, persistent chest pain or pressure, sudden dizziness, confusion, continuous vomiting, or bluish skin and lips. Introduction to Influenza and Swine Flu When flu season arrives each year, many patients wonder about the … Read more
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. EMERGENCY WARNING: If you or someone you care for has severe trouble breathing, chest pain, confusion, sudden dizziness, bluish lips, or high fever after being near birds or farm animals, call 911 or go to the nearest emergency room immediately. Introduction: Understanding Flu vs. Bird … Read more
If you or someone in your family woke up feeling as though you were hit by a truck, you are not alone. Health officials across the globe have reported sharp surges in severe influenza cases—commonly dubbed the “Super Flu.” Driven primarily by potent strains of Influenza A (H3N2), this variant is infamous for coming on … Read more
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. EMERGENCY WARNING: Seek immediate medical care or call 911 if you or someone you are caring for experiences severe trouble breathing, persistent chest pain or pressure, new confusion, pale/gray/blue skin or lip discoloration, or an inability to wake or stay awake. COVID-19 continues to circulate … Read more
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. ⚠️ EMERGENCY WARNING: Seek immediate medical evaluation or call 911 (or your local emergency number) if you experience sudden numbness, weakness on one side of your face or body, difficulty speaking, severe loss of vision, chest pain, or sudden confusion. These can be signs of … Read more
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. WARNING: EMERGENCY SIGNS Call 911 or go to the nearest emergency department immediately if you or someone under your care experiences severe lethargy, inability to keep fluids down for over 24 hours, confusion, rapid heart rate, bloody vomitus or stool, or no urination for more … Read more
Quick Answer: EMERGENCY WARNING: Seek immediate emergency medical care if you or a family member experience severe shortness of breath, persistent chest pain or pressure, new confusion, pale or blue-tinted lips/skin, or an inability to stay awake. Call 911 or visit the nearest emergency room without delay. Understanding the Cicada BA.3.2 Subvariant The SARS-CoV-2 virus … Read more
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. Key Takeways EMERGENCY WARNING: If you or someone in your care experiences difficulty breathing, persistent gasping, a high-pitched squeaking sound when breathing in (stridor), inability to swallow saliva, or bluish lips/face, call 911 or go to the nearest emergency room immediately. These symptoms indicate potential … Read more
Medically reviewed by Dr. Adam N. Khan, MD · Last updated October 7, 2026 · 14-minute read A quick note before you read: This is general health information, not personal medical advice, and it cannot diagnose you. If you have trouble breathing, can’t swallow liquids, are drooling, or your throat pain is far worse than … Read more
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. Key Takeaways EMERGENCY WARNING: Seek emergency medical care immediately if you or someone you are caring for experiences difficulty breathing, chest pain, blue lips or skin, severe confusion, a sudden drop in blood pressure, or a fever that returns with a worsening cough after initially … Read more
Medically reviewed by Dr. Adam N. Khan, MD · Last updated October 6, 2026 · 12-minute read A quick note before you read: This is general health information, not personal medical advice. If you develop fever, cough, or chest pain within a week of contact with sick animals — or with someone diagnosed with plague … Read more
Medically reviewed by Dr. Adam N. Khan, MD · Last updated October 5, 2026 · 10-minute read A quick note before you read: This is general health information, not personal medical advice, and it can’t tell you what your own risk is only your clinician can do that. What it can do is show you … Read more
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. Quick Summary: EMERGENCY WARNING: If your dog develops severe respiratory distress—such as rapid breathing, open-mouth panting while at rest, blue or pale gums, or extreme lethargy—contact your veterinarian or local emergency animal hospital immediately. Understanding COVID-19 Transmission Between Humans and Dogs When the SARS-CoV-2 pandemic … Read more