Correlate clinical features with causes and mechanisms of disease.

How Disease Becomes a Symptom

Start with one idea and everything in this chapter follows from it: a cell can only respond to injury in a small number of ways, and every symptom a patient describes is one of those cellular responses scaled up to the level of a tissue, an organ or the whole body. Disease is not magic. It is cell biology made loud enough to feel, see or measure. If you can trace a complaint back down that ladder — body → organ → tissue → cell — you can reason about a patient you have never seen before, which is exactly what the exam tests.

Cells are injured by a limited list of insults: hypoxia (too little oxygen), ischaemia (too little blood flow, which removes oxygen and substrate and the ability to clear waste), metabolic derangement, mechanical trauma, immune attack, infection, and toxins. The injury is at first reversible — the cell swells, its pumps falter, but if the insult is removed it recovers. Beyond a threshold of severity or duration it becomes irreversible and the cell dies. How it dies matters clinically.

The clinical lesson is direct: necrosis releases mediators and recruits inflammation, so necrotic processes hurt, swell, raise inflammatory markers and risk infection, whereas apoptosis is the silent housekeeping that makes a normal menstrual cycle and normal development possible.

The Tissue Responds in Three Ways

Zoom out from the single cell to the tissue. After any injury a tissue mounts one of three stereotyped responses, and the clinical picture depends on which.

• Acute inflammation is the immediate, stereotyped response to injury. Its five cardinal signs are the bedside features you already palpate: redness (rubor), heat (calor), swelling (tumor), pain (dolor) and loss of function. Each is a mechanism, not a label. Local vasodilatation brings more blood, producing redness and heat. Increased vascular permeability leaks protein-rich fluid (an exudate) into the interstitium, producing swelling. Mediators — histamine, prostaglandins, leukotrienes, bradykinin, complement, and cytokines such as interleukins and tumour necrosis factor — recruit neutrophils first, then macrophages, and sensitise nociceptors to cause pain and loss of function. This single paragraph explains why an inflamed Bartholin gland is a hot, red, tender, swollen lump that the patient cannot sit on, and why chorioamnionitis is fetal membranes packed with neutrophils.
• Tissue repair and wound healing follows once the insult is removed. Tissue either regenerates (replaced by the same cell type, restoring the original architecture) or undergoes repair by scar (connective tissue replaces what was lost). A clean, apposed wound heals by first intention; a gaping or contaminated wound heals by secondary intention with abundant granulation tissue and contraction. Healing is impaired by poor blood supply, infection, foreign material, excess movement and metabolic disease (diabetes, anaemia, hypoalbuminaemia) — which is precisely why a caesarean wound in an anaemic, diabetic or HIV-affected patient can dehisce, and why the same forces drive keloid at the other extreme.
• Chronic inflammation is inflammation and attempted healing happening at the same time, dominated by mononuclear cells — lymphocytes, plasma cells and macrophages — with fibroblast proliferation. Its specialised form, granulomatous inflammation (epithelioid macrophages walling off something the body cannot digest), is the pathology of genital tuberculosis and a high-burden reality in South Africa. Chronic pelvic inflammatory disease, endometriosis and longstanding fibrosis all sit here.

Cells Can Adapt Before They Fail

Between normal and dead, cells adapt — and naming the adaptation names the disease. These are not abstractions; the female genital tract demonstrates every one.

This ladder is the single most useful diagram in gynaecological oncology: the cervix shows the whole journey from metaplasia (a normal, vulnerable zone) through dysplasia (CIN, still curable by local treatment) to invasion (cancer that destroys tissue and spreads). Benign neoplasms stay local, are well differentiated and do not metastasise; malignant ones invade and spread, show atypical nuclei, abnormal mitoses and a high nuclear-to-cytoplasmic ratio. Nomenclature carries the message — -oma for benign mesenchymal tumours (leiomyoma), -sarcoma for their malignant counterparts (leiomyosarcoma), carcinoma for malignant epithelial tumours.

Fluid and Bleeding Are Mechanical Failures

Two more first principles close the foundation. Oedema is fluid in the wrong compartment, driven by raised hydrostatic pressure, low plasma oncotic pressure (hypoalbuminaemia), increased capillary permeability or blocked lymphatics — which is why vulval and generalised oedema appears in severe pre-eclampsia (leaky endothelium plus low albumin) and after lymph-node dissection. Haemorrhage is loss of blood from the vascular space because vessel integrity, the clotting cascade, platelet function or tissue support failed. Hold these two alongside cell death and inflammation and you have the complete toolkit: the rest of this chapter simply applies them to the symptoms women actually present with.

Clinical Features from Mechanisms

Clinical features are pathology made visible. A symptom is rarely a diagnosis by itself; it is a clue to a mechanism. Pain may be inflammatory, ischaemic, distension-related, spasm-related, neuropathic or peritoneal. Fever may be infection, inflammation, drug reaction or tissue necrosis. Bleeding may be vessel disruption, abnormal endometrium, pregnancy tissue, placental separation, coagulopathy or malignant ulceration.

The Primary skill is translation: