Rinnit Blog:
 

A doctor's plain-language guide to heart health: the 8 habits that protect your heart, the numbers to know, warning signs, and a simple 7-day starter plan.

Chest pain is the top heart attack symptom for everyone, but women more often have nausea, tiredness, shortness of breath, and jaw or back pain. Know the signs.

Left-side chest pain can come from the heart, lungs, stomach, muscles, or anxiety. Learn the warning signs that need emergency care and the common causes.

Normal blood pressure for adults of every age is below 120/80. Learn the blood pressure categories, why readings rise with age, and how to measure at home.

A sacral dimple is a small pit above a baby's buttock crease. Most are harmless. Learn which features need an ultrasound and when to call the doctor.

Sunburn is UV damage to the skin. Learn how long it lasts, how to treat it at home, the warning signs that need a doctor, and how to prevent it.

TL;DR: Retrograde menstruation occurs when menstrual blood flows backward through the fallopian tubes into the pelvic cavity instead of exiting the body through the vagina. While this phenomenon is a common and often asymptomatic part of the menstrual cycle, it is considered a primary risk factor for the development of endometriosis. Treatment is typically unnecessary unless the condition leads to chronic pelvic pain or reproductive health complications.

TL;DR: Retrognathia, commonly known as a receding chin, is a condition where the lower jaw is positioned further back than the upper jaw. While often viewed as a cosmetic concern, it can lead to functional issues such as obstructive sleep apnea, TMJ disorders, and feeding difficulties in infants. Treatment ranges from non-invasive orthodontics for children to corrective jaw surgery for adults, depending on the severity of the misalignment.

TL;DR: Retinopathy of prematurity (ROP) is an eye condition that affects babies born prematurely, typically before 31 weeks or weighing less than 3.3 pounds. It occurs when retinal blood vessels develop incorrectly, potentially leading to vision loss or retinal detachment. While most cases resolve without treatment, severe stages require urgent medical intervention such as laser therapy or injections to preserve sight.

TL;DR: Retinoblastoma is a rare but highly treatable eye cancer that primarily affects young children. It starts in the retina and is most often identified by a white-colored pupil (leukocoria) in photographs. While it can lead to vision loss, early diagnosis results in a cure rate of approximately 90%. Treatment options range from chemotherapy and laser therapy to surgery, depending on the severity and spread of the disease.

Retinal vein occlusion (RVO) is a blockage in the veins that drain blood from the retina. Learn the types, symptoms, risk factors, diagnosis, and treatments such as anti-VEGF injections and laser therapy.

A retinal tear is a split in the light-sensitive tissue at the back of the eye. Learn the warning signs, causes, diagnosis, and treatments like laser surgery and cryopexy.

Posterior urethral reconstruction repairs severe urethral narrowing near the bladder and prostate. Learn how the surgery works, what recovery looks like, success rates, and risks.

Renal denervation is a minimally invasive, catheter-based procedure that uses radiofrequency or ultrasound energy to calm overactive kidney nerves and lower blood pressure in resistant hypertension. Learn how it works, its benefits, recovery, and risks.

Renal artery stenting is a minimally invasive procedure that uses a tiny metal mesh tube to open blocked kidney arteries. Learn why it is performed, how it works, what recovery looks like, the risks, and answers to common questions.

Respiratory failure occurs when the body cannot maintain adequate oxygen levels or remove carbon dioxide. Learn the types, symptoms, causes, diagnosis, and emergency treatments.

Respiratory depression, or hypoventilation, is a condition where breathing is too slow or shallow to maintain proper gas exchange. This leads to a dangerous buildup of carbon dioxide (hypercapnia) and low oxygen levels (hypoxemia). Common causes include opioid or sedative overdose, obesity, and underlying neurological or lung conditions. Immediate treatment, such as naloxone or mechanical ventilation, is essential to prevent life-threatening complications like cardiac arrest

Relapsing-remitting multiple sclerosis (RRMS) is the most common form of MS, affecting 80% to 85% of people diagnosed. Learn about relapses, triggers, diagnosis, and treatment options.

Respiratory alkalosis occurs when your blood pH rises above 7.45 because you are breathing too rapidly (hyperventilating) and exhaling excessive carbon dioxide. While often triggered by anxiety or fever, it can also signal serious underlying conditions like sepsis or a pulmonary embolism. Treatment focuses on addressing the root cause, such as managing stress or treating an infection, to restore the body's natural acid-base balance.

Resistant hypertension is high blood pressure that remains above 140/90 mmHg despite the use of three or more different medications at maximum doses. Affecting approximately 12% of people with hypertension, it often requires a specialized diagnostic approach to rule out "white coat syndrome" and secondary causes like sleep apnea or kidney disease. Management involves optimizing medication adherence, adding targeted fourth-line agents, and strict lifestyle changes.