Table 2.

Systematic progression of symptoms in COVID-19 patients and their recovery stages.

Case Types	Day	Symptoms	Recovery Stages	Source
Mild	1	Common cold		[30]
	2	Mild sore throat		[51]
	3	Throat pain, Rise in body temperature, vomiting, nausea.		[51]
	4	Severe throat pain, weakness, joint pains		[51]
	5	Mild fever, dry cough, dyspnoea		[30]
	6	Breathing difficulty, Tiredness	Mild Cases Recovery	[52]
Moderate	7	Severe coughs, breathing difficulties, high fever, headache, body pain, worsening diarrhoea, and pneumonia. Patients need to admit to the hospital.		[30,51,53]
	8	Symptoms worsen for patients with pre-existing medical conditions.		[30]
	9	Frequent breathing, Average Sepsis infection starts (affects 40% of patients)		[51]
	10	Chest Diagnosis for Respiratory Distress	Moderate Cases Recovery	[54]
Severe	11	Loss of appetite, abdominal pain		[53]
	12	Fever relaxes slowly, breathing difficulties ceases.		[52,55]
	13
	14	Mouth cough persists, even after hospital discharge.		[52]
	15	Possible Cardiac Injury or Kidney Injury	Severe Cases Recovery	[56]
	16
Critical	17	Vulnerable patients develop a secondary infection in the lower respiratory tract, ARDS.		[30,54]
	18	Cases Become Fatal requiring treatment in ICU.		[57]
	19	Severe conditions lead to blood coagulation and ischemia.		[54]
	20	Requires oxygen therapy and ventilation		[54]
	21	Survivors recover Completely but are still contagious and prone.	Critical Cases Recovery	[54]