Signs of a patient going into anaphylactic shock include:

Tachycardia and pallor are indeed signs that can indicate a patient is going into anaphylactic shock. Anaphylaxis is a severe, life-threatening allergic reaction that can result in a rapid onset of symptoms. Among these, tachycardia, or an increased heart rate, occurs as the body attempts to maintain adequate blood flow in response to vascular collapse associated with anaphylaxis. Pallor, or a pale appearance, is due to the diversion of blood from the skin and extremities to vital organs, a compensatory mechanism when cardiovascular function is compromised.

This physiological response is part of the body's attempt to cope with the shock and maintain blood pressure and oxygenation to critical organs. Recognizing these signs is essential for timely intervention and management of anaphylaxis, which typically includes the administration of epinephrine and other supportive measures.