Signs and Symptoms of Disease

How to Compare Cosmetic Treatment Risks Beyond Before-and-After Photos

How to Compare Cosmetic Treatment Risks Beyond Before-and-After Photos

Before-and-after photos cannot predict your personal risk. Compare cosmetic procedures by evidence, provider credentials, common effects, serious warnings, recovery, reversibility, and follow-up.

Why Can an Early HIV Test Be Negative, and When Should It Be Repeated?

Why Can an Early HIV Test Be Negative, and When Should It Be Repeated?

An early HIV test can be negative during the window period. Learn when to repeat antibody, antigen/antibody, or NAT testing and when to seek prompt care.

Why Symptoms Can Ease Before an Appointment—and Return Later

Why Symptoms Can Ease Before an Appointment—and Return Later

Symptoms can fluctuate, so feeling better at a medical appointment does not erase the pattern. Learn what to track, what to tell your clinician, and when to seek urgent care.

Why Sleeping Longer on Weekends Can Make Weeknight Sleep Harder

Why Sleeping Longer on Weekends Can Make Weeknight Sleep Harder

Sleeping in can shift your body clock and leave less sleep pressure at bedtime. Learn what is common, what to try, and when sleep symptoms need clinical advice.

Which Early Pregnancy Symptoms Can Disappear and Still Be Normal?

Which Early Pregnancy Symptoms Can Disappear and Still Be Normal?

Early pregnancy symptoms can change or fade, but symptoms alone cannot confirm how a pregnancy is progressing. Learn what may be common, which warning signs need urgent care, and what to ask your clinician.

Fatty Meals and Upper-Abdominal Pain: Why It Can Start Hours Later

Fatty Meals and Upper-Abdominal Pain: Why It Can Start Hours Later

A fatty meal may precede upper-abdominal pain, but it does not prove gallstones. Compare common causes, track useful clues, and know which symptoms need urgent care.

Why One Testicle Hangs Lower—and When to Get Medical Care

Why One Testicle Hangs Lower—and When to Get Medical Care

One testicle sitting lower is often normal. Learn why position varies, which new changes need a checkup, and when sudden pain requires emergency care.

42 Weeks Pregnant: What Usually Happens and What to Ask About Monitoring

42 Weeks Pregnant: What Usually Happens and What to Ask About Monitoring

At 42 weeks, learn what postterm pregnancy means, what monitoring can and cannot show, common next steps, red flags, and questions to ask your care team.

Why Breast Pain Can Change During the Month—and When to Get It Checked

Why Breast Pain Can Change During the Month—and When to Get It Checked

Breast pain can follow menstrual or other hormone changes, but persistent focal pain and new breast changes deserve an examination. Learn what to track and when to seek care.

How to Protect Your Skin Barrier While Using Active Ingredients

How to Protect Your Skin Barrier While Using Active Ingredients

Learn which skincare habits help reduce irritation from retinoids, acids, and acne treatments, how moisturizers and sunscreen fit, and when to seek care.

Reduced Fetal Movement: When to Call Your Maternity Care Team Right Away

Reduced Fetal Movement: When to Call Your Maternity Care Team Right Away

Call your maternity care team now if fetal movement is less, stops, or changes from your baby's usual pattern. Learn what to report and what not to delay.

Why Fatigue, Pain, and Mood Symptoms Can Change Across Your Menstrual Cycle

Why Fatigue, Pain, and Mood Symptoms Can Change Across Your Menstrual Cycle

Learn why fatigue, pain, and mood can shift across the menstrual cycle, what remains uncertain, how to track patterns, and which symptoms need medical attention.

Can You Get Vaccinated With a Mild Illness? When to Keep or Reschedule

Can You Get Vaccinated With a Mild Illness? When to Keep or Reschedule

Learn when a mild cold or low fever usually does not delay vaccination, when moderate or severe illness may warrant postponement, and what to ask the clinic.

Missed a Birth Control Pill? What to Do Depends on the Type

Missed a Birth Control Pill? What to Do Depends on the Type

Missed contraceptive pill instructions vary by type. Learn what CDC guidance says for combined pills, norethindrone, norgestrel, and drospirenone.

How to Support Your Child Through a Difficult Phase Without Fixing Everything

How to Support Your Child Through a Difficult Phase Without Fixing Everything

Learn how to listen, coach problem-solving, and support a child through a hard phase while recognizing when persistent distress or safety concerns need help.

Why Dermatology Symptoms Can Come and Go—and What to Track Before Your Appointment

Why Dermatology Symptoms Can Come and Go—and What to Track Before Your Appointment

Skin, hair, and nail symptoms can flare, fade, and return. Learn common reasons, what details and photos to track, and which red flags need prompt medical care.

Can You Have Morning Erections and Still Have Erectile Difficulties During Sex?

Can You Have Morning Erections and Still Have Erectile Difficulties During Sex?

Yes. Morning erections can coexist with erection difficulties during sex. Learn what they may suggest, what they cannot rule out, when to seek care, and urgent warning signs.

When Mild Symptoms Add Up: Combinations That Deserve Prompt Medical Attention

When Mild Symptoms Add Up: Combinations That Deserve Prompt Medical Attention

Some symptoms seem minor alone but become more concerning in combination. Learn which patterns warrant prompt or emergency care, what common explanations can look similar, and what details to notice.

Why Can One Nostril Feel Blocked While the Other Is Clear?

Why Can One Nostril Feel Blocked While the Other Is Clear?

One-sided nasal stuffiness often reflects the normal nasal cycle, but colds, allergies, and persistent blockage can matter. Learn what to watch for and when to seek care.

Why Can Desire, Arousal, and Physical Response Differ?

Why Can Desire, Arousal, and Physical Response Differ?

Sexual desire, mental arousal, and genital response do not always move together. Learn common reasons, what consent means, and when a change deserves medical care.

A New Breast Lump: Common Noncancerous Causes and How Doctors Usually Check It

A New Breast Lump: Common Noncancerous Causes and How Doctors Usually Check It

A new breast lump is often caused by a benign condition, but it still deserves evaluation. Learn common causes, red flags, and how ultrasound, mammography, and biopsy are used.

Can Normal Blood-Test Results Still Miss the Cause of Persistent Symptoms?

Can Normal Blood-Test Results Still Miss the Cause of Persistent Symptoms?

Normal blood tests can be reassuring without explaining persistent symptoms. Learn what results can miss, what to ask next, and which warning signs need urgent care.

Why Do Children Sometimes Have a Fever With No Other Symptoms?

Why Do Children Sometimes Have a Fever With No Other Symptoms?

Learn why a child may have a fever before other symptoms appear, what the 2026 AAP UTI guidance changes, and when to seek urgent medical care.

Why Sexual Desire Can Change Even in a Secure Relationship

Why Sexual Desire Can Change Even in a Secure Relationship

Sexual desire can shift with stress, sleep, health, pain, hormones, and medication—even in a secure relationship. Learn what is common and when to seek support.

Why Your Heart Rate Can Jump During Light Activity Even When Resting Normally

Why Your Heart Rate Can Jump During Light Activity Even When Resting Normally

A normal resting heart rate is only one snapshot. Learn why it can rise with light activity, what to track, and which symptoms need urgent medical care.

Why Blood Pressure Readings Differ Between Arms or Change Within Minutes

Why Blood Pressure Readings Differ Between Arms or Change Within Minutes

Learn why blood-pressure readings vary between arms or minutes apart, how to improve home measurements, and when persistent differences or high readings need medical attention.

Why Can Andrology Symptoms Come and Go? What to Track Before a Medical Visit

Why Can Andrology Symptoms Come and Go? What to Track Before a Medical Visit

Andrology symptoms can fluctuate for many reasons. Learn what to track before an appointment, what patterns may help, and which urinary or testicular symptoms need urgent care.

Postpartum Anxiety or New-Parent Worry? How to Tell When to Reach Out

Postpartum Anxiety or New-Parent Worry? How to Tell When to Reach Out

Learn how postpartum anxiety may differ from common new-parent worry, what patterns to notice, how to talk with a clinician, and which warning signs need urgent help.

Why a Tooth Can Hurt When You Bite but Not With Hot or Cold

Why a Tooth Can Hurt When You Bite but Not With Hot or Cold

One tooth hurts when you bite, but hot and cold drinks feel fine? Learn possible causes, when to see a dentist, and which symptoms need urgent care.

People, Animals, or Cells? How to Check the Research Behind a Health Headline

People, Animals, or Cells? How to Check the Research Behind a Health Headline

Learn to trace a health-news headline to its study, identify whether it involved people, animals, or lab models, and judge what the results can—and cannot—show.

Recognizing the Signs, Symptoms of Disease. Percentage of people infected. Treatment methods.