Hihy Health
Encyclopedia

RSV (Respiratory Syncytial Virus) Infection

#RSV, #respiratory syncytial virus, #bronchiolitis, #children, #infants, #wheezing, #premature infants, #feeling feverish, #body heat, #high fever, #low-grade fever, #dry cough, #persistent minor cough, #cough that will not stop, #stuffy nose, #clear runny nose, #yellow runny nose

RSV (respiratory syncytial virus) is the most common virus that causes bronchiolitis (inflammation of the small airways) and pneumonia in infants and young children. It is highly contagious, and most children are infected at least once before the age of 2. Premature infants, children with congenital heart disease, and people with weakened immunity need to take extra care.

2026-06-26

Schizophrenia

#schizophrenia, #delusions, #auditory hallucinations, #hallucinations, #negative symptoms, #antipsychotic medication, #mental health, #constipation, #difficulty passing stool, #hard stool, #hand tremor, #body tremor, #anxious feeling in the chest, #restlessness, #worrying for no reason

Schizophrenia is a major mental illness in which the ability to distinguish reality from one's own thoughts and perceptions is impaired. In Korean, the disorder was previously called jeongsinbunyeolbyeong (literally, "split-mind disease") but was renamed johyeonbyeong in 2011; the new term means "tuning the strings," reflecting the idea that mental confusion arises when the brain's neural signaling is not properly tuned. With appropriate treatment and management, people with schizophrenia can maintain daily functioning.

2026-06-26

Scrub Typhus

#scrub typhus, #mites, #fall febrile illness, #fever, #rash, #grave visits, #outdoor activity, #headache, #a splitting headache, #migraine, #back-of-head pain, #feverish, #having a fever, #high fever, #low-grade fever, #body shaking, #chills, #feeling cold and shivering, #hand tremor, #body tremor

Scrub typhus is an acute febrile infectious disease that occurs mainly in the fall. It is caused by the bite of a chigger mite larva carrying the bacterium Orientia tsutsugamushi. Covering the skin well during outdoor activity and showering afterward are key to prevention. If flu-like symptoms develop after outdoor activity in the fall, please consult a medical specialist.

2026-06-26

Seasonal Affective Disorder (Seasonal Depression)

#seasonal affective disorder, #depression, #major depressive disorder, #fall depression, #winter depression, #amount of sunlight, #circadian rhythm, #mood disorder, #lack of energy, #fatigue, #feeling tired all the time

Seasonal depression is a condition in which depression appears repeatedly and is closely tied to a particular season, such as fall or winter. The accurate diagnostic name is "major depressive disorder, with seasonal pattern." Changes in the amount of sunlight and disruption of the body's circadian rhythm are presumed to be among the causes. If low mood is serious enough to interfere with daily life, please consult a psychiatrist.

2026-06-26

Seborrheic Dermatitis

#seborrheic dermatitis, #dandruff, #scalp, #eyebrows, #erythema, #scaling, #dermatitis, #winter

Seborrheic dermatitis is a chronic skin condition in which dry or greasy yellowish scales form on top of areas of erythema (redness). If symptoms recur, please consult a dermatologist.

2026-06-26

Secondary Amenorrhea

#amenorrhea, #secondary amenorrhea, #polycystic ovary syndrome, #premature ovarian insufficiency, #irregular periods, #hormone testing, #gynecology, #irregular menstrual cycle, #missed period, #late period

Secondary amenorrhea refers to the absence of menstruation for three months or longer in a woman who previously had normal menstrual cycles. It has various causes, and if left unaddressed for a long time, it can affect overall health. Because treatment differs depending on the cause, evaluation by a medical specialist is needed.

2026-06-26

Secondhand Smoke (Passive Smoking)

#secondhand smoke, #passive smoking, #smoking cessation, #heart disease, #stroke, #lung cancer, #diabetes mellitus, #respiratory system, #headache, #a splitting headache, #migraine, #back-of-head pain, #dry cough, #persistent cough, #cough that won't stop, #blood-streaked sputum, #coughing up blood, #weakness in arms and legs, #difficulty moving one side of the body

Secondhand smoke exposure, also called passive smoking, means that a person who does not smoke breathes in smoke from a smoker's cigarette. Tobacco smoke contains thousands of chemicals, including carcinogens (substances that can cause cancer), and long exposure in an enclosed space can be harmful even to nonsmokers. If you are concerned about secondhand smoke, please consult a medical specialist.

2026-06-26

Severe Obesity

#severe obesity, #diet, #weight loss, #diabetes mellitus, #bariatric surgery

Severe obesity goes beyond simple overweight; it is a condition in which excessive fat accumulates in the body and causes serious complications. It is not a short-term cosmetic diet but a condition directly tied to life and health, so rather than judging on your own, you should see a specialist for safe, long-term treatment.

2026-06-26

Shoulder Pain

#shoulder pain, #rotator cuff tear, #frozen shoulder, #adhesive capsulitis, #calcific tendinitis, #cervical radiculopathy, #glenohumeral arthritis, #arthroscopic surgery

The main causes of shoulder pain are rotator cuff tear, adhesive capsulitis (frozen shoulder), calcific tendinitis, and cervical radiculopathy. Because treatment differs depending on the cause, an accurate diagnosis is important. If shoulder pain persists, please consult a medical specialist.

2026-06-26

Skin Aging

#skin aging, #photoaging, #wrinkles, #ultraviolet radiation, #aged skin, #dry skin, #hyperpigmentation

Skin aging refers to changes that occur in the skin over time, including wrinkles, reduced elasticity, and pigmentation changes. Sun protection and consistent skin care can help slow this process. If any new abnormality appears on the skin, please consult a medical specialist.

2026-06-26

Skin Cancer

#skin cancer, #basal cell carcinoma, #squamous cell carcinoma, #malignant melanoma, #ultraviolet radiation, #skin tumor, #early detection, #body swelling, #facial swelling, #leg swelling, #swelling of the hands and feet

Skin cancer is a malignant tumor that develops in the skin. A malignant tumor is an abnormal mass of cells that harms the body. In its early stages, it may cause no symptoms or may resemble an ordinary mole or age spot. If you notice any unusual changes, please consult a dermatology specialist.

2026-06-26

Sleep Apnea

#sleep apnea, #snoring, #polysomnography, #positive airway pressure device, #CPAP, #insomnia, #daytime sleepiness, #high blood pressure, #headache, #a splitting headache, #migraine, #back-of-head pain, #lack of energy, #fatigue, #feeling tired all the time

Sleep apnea is a condition in which breathing repeatedly stops or becomes markedly reduced for 10 seconds or longer during sleep. If left untreated, it can worsen various systemic conditions such as high blood pressure, heart disease, stroke, and diabetes mellitus. It is not a simple sleeping habit but a condition that may require treatment. If you snore heavily or feel severe daytime sleepiness, please consult an ENT specialist.

2026-06-26

Sleep Disorders and Dementia

#sleep disorders, #dementia, #insomnia, #sleep apnea, #REM sleep, #restless legs syndrome, #Alzheimer's disease, #cognitive function, #lack of energy, #fatigue, #feeling tired all the time, #cannot fall asleep, #waking up often, #cannot sleep deeply, #anxious feeling in the chest, #restlessness, #worrying for no reason

Sleep is an important time for the brain to recover from fatigue and organize memories. Sleep disorders are more than a simple inconvenience; they are associated with cognitive decline and an increased risk of dementia. If sleep problems persist, please consult a medical specialist.

2026-06-26

Smoking, Health, and Quitting Smoking

#Smoking, #Smoking cessation, #E-cigarettes, #Nicotine, #Tar, #Lung cancer, #Cardiovascular disease, #COPD, #Smoking cessation medication, #Nicotine addiction, #Weakness in arms or legs, #One-sided weakness, #Chest anxiety, #Restlessness, #Unexplained worry, #Feeling down, #Lack of motivation, #Not wanting to do anything

Both regular cigarettes and e-cigarettes are harmful to health. Smoking raises the risk of many conditions, including lung cancer and other cancers, cardiovascular disease, and chronic obstructive pulmonary disease (COPD). Quitting smoking is not easy, but getting help from a medical specialist makes success more likely. If you've decided to quit, please work with a healthcare team rather than trying on your own.

2026-06-26

Snoring

#snoring, #sleep, #airway, #uvula, #obesity, #sleep apnea, #otolaryngology, #headache, #severe headache, #migraine, #back-of-head pain, #nasal congestion, #clear nasal discharge, #yellow nasal discharge

Snoring is a sound produced when the airway in the throat narrows during sleep. Although it may seem like a simple sleep habit, it can progress to sleep apnea. Sleep apnea is associated with various systemic conditions, including high blood pressure, heart disease, and stroke. If snoring is severe or accompanied by apnea, please consult an otolaryngology (ear, nose, and throat) specialist.

2026-06-26