**Question:** Cause of acute abdomen in pregnancy are all except:

A. Appendicitis
B. Dengue fever
C. Cholera
D. Typhoid fever

**Core Concept:**
Acute abdomen in pregnancy is a medical emergency characterized by sudden onset abdominal pain and possible complications related to the pregnant state. The differential diagnosis should take into account the specific challenges and considerations presented by pregnancy. Understanding the causes that are not applicable to pregnant patients is crucial for proper diagnosis and treatment.

**Why the Correct Answer is Right:**
Dengue fever, cholera, and typhoid fever are all infectious diseases caused by viruses, bacteria, and parasites, respectively. These conditions are typically not considered as causes of acute abdomen in pregnant patients due to their specific modes of transmission (vector-borne, contaminated water, and contaminated food, respectively) and the risk of complications for the mother and the fetus.

**Why Each Wrong Option is Incorrect:**

A. Appendicitis: Appendicitis is a common cause of acute abdomen in non-pregnant patients. Although pregnant patients are at a higher risk due to anatomical and physiological changes, appendicitis can still occur. In this context, Dengue fever, cholera, and typhoid fever are wrong options because they are unrelated to acute abdomen in pregnancy.

B. Dengue fever: Dengue fever is caused by a virus transmitted by mosquitoes, making it an unlikely cause of acute abdomen in pregnancy. Pregnant women are at an increased risk of severe dengue due to physiological changes, but the disease itself is not directly related to acute abdomen.

C. Cholera: Cholera is caused by Vibrio cholera and transmitted through contaminated water, making it an unlikely cause of acute abdomen in pregnancy. Similar to Dengue fever, pregnant women are at an increased risk of severe cholera due to physiological changes, but the disease itself is not directly related to acute abdomen.

D. Typhoid fever: Typhoid fever is caused by Salmonella typhi and transmitted through contaminated food, making it an unlikely cause of acute abdomen in pregnancy. Pregnant women are at an increased risk of severe typhoid due to physiological changes, but the disease itself is not directly related to acute abdomen.

**Clinical Pearls:**

1. Acute abdomen in pregnancy should primarily be considered due to obstetric causes (e.g., ectopic pregnancy, uterine rupture, placental abruption, etc.) or medical causes (e.g., acute appendicitis, acute cholecystitis, etc.).
2. In cases where the exact cause is unclear, further investigations should be conducted (e.g., ultrasound, CBC, etc.) to identify the underlying pathology.
3. In the context of acute abdomen in pregnancy, it is crucial to differentiate between abdominal pain caused by obstetric and medical causes to ensure appropriate management and reduce maternal and fetal morbidity and mortality.

**Why Correct Answer:**

The correct answer is B, C, and D because these options are primarily related to gastrointestinal infections and are not directly associated with acute abdomen