Patients with<unk>  usually present with gray or bluish skin discoloraion.<unk><unk>  of patients with<unk>  is usually remarkable for headache, tachycardia, dyspnea and lightheadedness.
Methemoglobinemia physical examination
Methemoglobinemia laboratory findings
Lead poisoning physical examination
Cyanosis physical examination
Altitude sickness physical examination
Paroxysmal nocturnal hemoglobinuria physical examination
Macrocytic anemia physical examination
Thalassemia physical examination