Human Diseases and Health Challenges
Functional Disorders
Functional disorders occur when the body’s cells, tissues, or organs experience operational disturbances. Some dysfunctions affect metabolism, causing metabolic diseases like diabetes. Degenerative diseases, such as Parkinson’s and cancer, cause severe structural damage to cells, tissues, or organs. Treating these diseases typically requires specialized medical intervention.
Tumors and Cancer
When the natural cellular self-destruct mechanism malfunctions, uncontrolled cell growth can lead to tumors or neoplasms. If abnormal cells remain localized, the tumor is benign. If they spread through the bloodstream, forming secondary tumors, it is malignant and called cancer. Cancer therapies range from surgical removal to radiotherapy, with new techniques targeting only cancerous cells.
Cardiovascular Diseases
Major cardiovascular diseases include ischemic heart disease, aneurysms, and arteriosclerosis. Ischemic heart disease occurs when coronary arteries become partially or fully occluded, depriving the heart of necessary blood supply. Total occlusion can cause myocardial infarction (heart muscle necrosis). Aneurysms are abnormal dilations in the aorta, a natural degenerative process. Atherosclerosis causes hardening and loss of elasticity in the arteries.
Transplants
Transplantation involves implanting an organ or tissue from a donor to a recipient. Organ transplants (kidney, heart, liver) are complex surgical procedures, while tissue transplants (bone marrow) involve injecting cells into the bloodstream. Compatibility is a major challenge. Transplant procedures are constantly improving.
Nervous System Diseases
The brain and spinal cord control movement and sensation. Malfunctions can cause abnormalities like epilepsy and paralysis. Paralysis, typically caused by trauma, is the functional cancellation of nerve fibers. Epilepsy is a syndrome caused by altered nerve cell activity, ranging from widespread seizures with loss of consciousness to localized seizures affecting specific body parts. Demyelinating diseases destroy the myelin sheath surrounding nerve fibers, as seen in multiple sclerosis. Alzheimer’s disease, a leading cause of dementia, involves neuronal atrophy in cognitive areas, impairing memory, attention, and speech. Parkinson’s disease results from neuronal degeneration in the brain’s base, affecting motor control and causing tremors.
Sexually Transmitted Infections (STIs)
STIs are primarily transmitted through sexual contact, blood transfusions, or shared needles. Syphilis, gonorrhea, and genital herpes are common STIs spread through sexual contact, often facilitated by overcrowding. Rapid diagnostic methods and antibiotic therapy are available. Hepatitis B and AIDS can also be transmitted sexually or through blood. Hepatitis B causes liver inflammation, while AIDS causes immunodeficiency.
Mental Illness
Mental health encompasses a state of well-being beyond the absence of disease, including conflict resolution, personal autonomy, and adaptation to reality. Mental health involves psychological, biological, and social factors. Mental illnesses range from disorders caused by physical changes (tumors, circulatory problems) to mental retardation, affective disorders (depression), neurotic disorders (anxiety, obsessions), psychotic disorders (schizophrenia), and severe personality disorders (psychopathy).
Nutritional Diseases
A varied and balanced diet is crucial for maintaining good health. Nutritional disorders can arise from poor eating habits, including obesity and malnutrition. These disorders can be caused by excess or deficit of nutrients, digestive system problems, or eating disorders with a nervous component. Caloric excess can lead to obesity, while insufficient intake causes malnutrition. Digestive system disorders can be related to specific foods, lack of teeth, or poor habits. Celiac disease involves gluten intolerance. Gastritis is inflammation of the stomach lining, while gastric ulcers are deeper wounds. Anorexia involves abnormal eating behavior and fear of obesity, leading to a distorted body image and anxiety. Bulimia involves cycles of binge eating followed by purging. Foods provide essential nutrients (carbohydrates, protein, fats, vitamins, water) for bodily functions.