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Signs and symptoms of RDS usually happen at birth or within the first few hours that follow. Depending on the severity of a newborn's RDS, he or she may develop bronchopulmonary dysplasia or other medical problems, such as bleeding in the brain, kidney failure, or lung complications.

The types of angina are stable, unstable, microvascular, and variant. The types vary based on their severity or cause.

Many people who have conduction disorders, such as first-degree AV block, may have no obvious signs or symptoms. Others may have signs and symptoms that occur in specific situations, such as when you experience physical or emotional stress or when you sleep. Conduction disorders can lead to life-threatening arrhythmias if undiagnosed or untreated.

Los signos y síntomas frecuentes de la apnea del sueño son los ronquidos o los jadeos durante el sueño, la respiración reducida o ausente (denominada "episodio de apnea") y la somnolencia. La apnea del sueño sin diagnosticar o tratar impide el sueño reparador y puede causar complicaciones que afecten muchas partes del cuerpo.

Damage to the lung’s air sacs—called alveoli—causes ARDS. Fluid from tiny blood vessels leaks through the damaged walls of the air sacs and collects, limiting the lungs’ normal exchange of oxygen and carbon dioxide. The damage also causes inflammation that leads to the breakdown of surfactant—a liquid that helps keep your air sacs open.

The body’s muscles and nervous system help control your breathing. The lungs are like sponges; they cannot move on their own. Muscles in your chest and abdomen contract, or tighten, to create space in your lungs for air to flow in. The muscles then relax, causing the space in the chest to get smaller and squeeze the air back out. Your breathing usually does not require any thought, because it is controlled by the autonomic nervous system, also called the involuntary nervous system.

Breathing involves two phases: breathing in and breathing out. Your lungs deliver oxygen and remove carbon dioxide from your blood in a process called gas exchange. Gas exchange happens in the capillaries surrounding the alveoli, where the oxygen that is breathed in enters the circulatory system and carbon dioxide in the blood is released to the lungs and then breathed out. If you have problems breathing, gas exchange may be impaired, increasing the risk of serious health problems.

Signs and symptoms of DIC depend on whether the condition is acute or chronic. Acute DIC is more severe and develops quickly over hours or days. Chronic DIC happens more slowly and sometimes has no signs or symptoms. Complications from DIC can occur from both the clotting that happens in the early stages of the condition and from bleeding in the later stages. Serious complications include organ damage and hemorrhage.

Marfan syndrome is a genetic condition caused by a mutation, or change, in one of your genes, called the fibrillin-1 (FBN1) gene. The FBN1 gene makes fibrillin-1, which is a protein that forms elastic fibers within connective tissue. Fibrillin-1 also affects levels of another protein that helps control how you grow.

Certain diseases, conditions, or factors can raise your risk for cardiomyopathy. Major risk factors include a family history, preexisting disease or condition, diabetes, diseases that can damage the heart, long-term alcoholism, and long-term high blood pressure.