Hihy Health
Encyclopedia

Acute Hemorrhagic Conjunctivitis (Apollo Conjunctivitis)

#Apollo conjunctivitis, #acute hemorrhagic conjunctivitis, #enterovirus, #subconjunctival hemorrhage, #red eyes, #contagious, #body swelling, #facial swelling, #leg swelling, #swelling in hands and feet

Acute hemorrhagic conjunctivitis is a contagious eye infection caused by an enterovirus. It is characterized by bleeding beneath the conjunctiva (the membrane covering the white of the eye), which turns the eye red. It is also called "Apollo conjunctivitis" from the time of the 1969 outbreak.

2026-06-26

ADHD (Attention-Deficit/Hyperactivity Disorder)

#ADHD, #inattention, #hyperactivity disorder, #concentration, #impulsivity, #children and adolescents, #dopamine

ADHD (attention-deficit/hyperactivity disorder) is a neurodevelopmental condition whose main symptoms are inattention, hyperactivity, and impulsivity. It mainly appears in childhood and adolescence, but it can continue into adulthood. If you suspect symptoms, please consult a medical specialist for an examination and evaluation.

2026-06-26

Air-Conditioning Sickness

#air-conditioning sickness, #air conditioner, #temperature difference, #Legionella, #summer health, #head pain, #fatigue, #indoor ventilation, #stomachache, #tummy ache, #bellyache, #pain inside the abdomen, #headache, #splitting headache, #migraine, #pain at the back of the head, #body shaking, #feeling cold and shivering, #cold sensation, #lack of energy, #listlessness, #persistent tiredness, #loose stools, #watery diarrhea, #frequent bathroom visits, #unable to pass stool, #difficulty having a bowel movement, #hard stools, #hand tremor, #body tremor

Air-conditioning sickness is a general term for the various physical symptoms that appear when air conditioners or other cooling devices are overused and the temperature difference between indoors and outdoors becomes large. It is not an officially defined medical diagnosis, but headache, fatigue, and digestive problems may occur. In most cases, symptoms may improve within a few days if use of cooling devices is reduced. If symptoms are severe or accompanied by a high fever, please consult a medical specialist.

2026-06-26

Anterior Cruciate Ligament (ACL) Tear

#anterior cruciate ligament, #ACL tear, #knee ligament, #sports injury, #ligament reconstruction, #arthroscopy, #knee injury, #anxious feeling in the chest, #restlessness, #worrying for no reason

An anterior cruciate ligament (ACL) tear is a rupture of the ACL, a ligament located inside the knee joint. It most often occurs during sports involving quick changes in direction. Complete tears usually require surgical treatment. If you have symptoms, please consult a medical specialist.

2026-06-26

Aortic Dissection

#Aortic dissection, #Chest pain, #Aorta, #Emergency, #High blood pressure, #Cardiothoracic surgery, #Vascular graft, #Stent, #Acute aortic dissection, #Chest ache, #Tight chest, #Chest tightness, #Weakness in arms or legs, #One-sided weakness

Aortic dissection is a medical emergency in which the wall of the aorta — the largest artery in the body — tears starting from its inner layer. It is marked by the sudden onset of severe, stabbing chest pain. Without prompt treatment, it can be life-threatening. If these symptoms occur, please call emergency services (119 in Korea) right away and go to the emergency room.

2026-06-26

Aortic Valve Stenosis

#Aortic valve stenosis, #Aortic valve, #TAVI, #Heart valve, #Age-related disease, #Chest ache, #Chest pain, #Tight chest, #Chest tightness, #Collapsing, #Losing consciousness, #Fainting

Aortic valve stenosis is a condition in which the aortic valve — a one-way door between the heart and the aorta that keeps blood flowing in a single direction — no longer opens properly, restricting blood flow. It is a common condition of aging: more than 1 in 10 people age 80 and older have it. In patients with severe disease and symptoms, the condition can worsen quickly without appropriate treatment, so evaluation by a medical specialist is very important.

2026-06-26

Atlantoaxial Instability (Cervical Instability)

#cervical instability, #first cervical vertebra (C1), #second cervical vertebra (C2), #cervical disc herniation, #cervical spine surgery, #rheumatoid arthritis, #cervical fusion, #spinal cord, #numbness in hands and feet, #arm numbness, #tingling leg, #weakness in arms and legs, #difficulty moving one side of the body, #anxious feeling in the chest, #restlessness, #worrying for no reason

Cervical instability (atlantoaxial instability) is a condition in which the connection between the first and second neck bones (cervical vertebrae) becomes loose and allows excessive movement. Mild cases may cause no symptoms, but as it progresses it can compress the spinal cord and lead to serious nerve damage. It is relatively common in patients with rheumatoid arthritis. Please be sure to decide on an accurate diagnosis and treatment approach through a medical specialist.

2026-06-26

Benign Paroxysmal Positional Vertigo (BPPV)

#benign paroxysmal positional vertigo, #BPPV, #dizziness, #vertigo, #vestibular system, #semicircular canals, #canalith repositioning, #ear, #balance, #feeling dizzy, #spinning sensation, #unsteadiness, #feeling faint, #nausea, #feeling like vomiting, #vomiting, #ringing in the ear, #tinnitus, #hearing loss, #difficulty hearing

Benign paroxysmal positional vertigo (BPPV) occurs when tiny particles called otoconia become dislodged from the balance organ of the inner ear (the vestibular system) and enter the semicircular canals. Otoconia are small crystals made of calcium carbonate, sometimes described as "ear stones." The main symptom is a spinning sensation that occurs with changes in head position. If you experience dizziness, please consult an ENT specialist.

2026-06-26

Benign Prostatic Hyperplasia (BPH)

#benign prostatic hyperplasia, #prostate, #lower urinary tract symptoms, #frequent urination, #nocturia, #urinary urgency, #sense of incomplete bladder emptying, #acute urinary retention, #alpha-blocker, #transurethral resection of the prostate, #headache, #a splitting headache, #migraine, #back-of-head pain, #urinating frequently, #frequent trips to the bathroom, #blood in urine, #red urine, #bloody urine

Benign prostatic hyperplasia (BPH) is a very common condition in men in which the prostate enlarges with age, narrowing the urethra and causing urinary symptoms. The prevalence rises with age, affecting about 50% of men in their 50s and 60% of men in their 60s. Without treatment, it can lead to complications such as acute urinary retention or kidney failure, so if you have symptoms, please consult a urologist.

2026-06-26

Blood Cancer

#blood cancer, #leukemia, #multiple myeloma, #platelets, #bone marrow, #anemia, #chemotherapy, #hematopoietic stem cell transplantation

Blood cancer refers to cancer that arises in the bone marrow, the organ responsible for producing blood cells. The bone marrow makes three types of blood cells: white blood cells, red blood cells, and platelets. When the bone marrow malfunctions, abnormalities in the number, shape, or function of these cells can cause a variety of symptoms. Frequent nosebleeds or easy bruising can occur, but these symptoms do not necessarily mean a person has blood cancer. If abnormal results appear on a blood test, please consult a hematology-oncology specialist.

2026-06-26

Breast Cancer

#Breast cancer, #Breast cancer surgery, #Breast reconstruction, #Robotic surgery, #Lymph nodes, #Breast cancer screening, #Inconclusive result, #Lymphedema, #Body swelling, #Face swelling, #Leg swelling, #Swollen hands and feet

Breast cancer is a malignant tumor that develops in breast tissue, and it is one of the more common cancers in women. Surgical and reconstruction techniques continue to advance, and outcomes are generally good when the cancer is found early. If a breast screening shows an abnormal result, or if you notice a lump or a change in the skin, please see a medical specialist.

2026-06-26

Cataract

#cataract, #lens, #vision loss, #presbyopia, #macular degeneration, #phacoemulsification, #intraocular lens, #multifocal lens, #blurry vision, #difficulty seeing, #cloudy vision, #double vision, #overlapping images

A cataract is a condition in which the lens inside the eye, which acts like a camera lens, becomes cloudy and vision declines. Aging is the most common cause. If your vision is blurry or dim, please consult an eye specialist (ophthalmologist).

2026-06-26

Cerebrovascular Disease (Stroke)

#stroke, #cerebral infarction, #cerebral hemorrhage, #thrombolysis, #thrombectomy, #cerebrovascular disease, #winter stroke, #first aid, #post-stroke sequelae, #multidisciplinary care, #headache, #splitting headache, #migraine, #pain at the back of the head, #lightheadedness, #spinning sensation, #unsteadiness, #vision going dark, #weakness in the arms or legs, #difficulty moving one side of the body

Cerebrovascular disease (stroke) is a condition in which a blood vessel in the brain becomes blocked or ruptures, causing brain damage. To minimize aftereffects, prompt emergency response is most important, under the principle that 'time is brain.' The risk of stroke is especially high in winter and during seasonal changes, so please follow the prevention guidelines carefully.

2026-06-26

Cholinergic Urticaria

#cholinergic urticaria, #hives, #exercise, #sweating, #body temperature, #allergy, #stinging sensation, #abdominal pain, #stomachache, #abdominal discomfort, #stomach pain

Cholinergic urticaria is a condition in which numerous small hives appear on the skin when body temperature rises, such as from strenuous exercise, mental stress, or a hot bath. Please consult a dermatology specialist.

2026-06-26

Chronic Fatigue Syndrome

#chronic fatigue syndrome, #antidepressants, #cognitive behavioral therapy, #exercise therapy, #chronic fatigue, #fatigue, #sleep disorder, #depression, #rehabilitation, #headache, #splitting headache, #migraine, #pain at the back of the head, #lack of energy, #listlessness, #persistent tiredness

Chronic fatigue syndrome is a condition in which severe fatigue persists for 3 months or longer even with adequate rest. Because there are many hypotheses about its cause, treatment is tailored to each individual. Antidepressants, cognitive behavioral therapy, and graded exercise therapy have been reported to be helpful. Please consult a medical specialist before deciding on the direction of treatment.

2026-06-26