If a patient was diagnosed and suffered from dengue in the last one year, he or she needs to be careful as a second attack could turn out to be more dangerous than the first attack.
Further, a person who has dengue can also, at the same time, suffer from malaria. Now, dengue and malaria, together, can decrease platelet counts to critical level - resulting in complications.
A important thing to remember is that in dengue season, nobody should have aspirin when having fever as it can trigger bleeding.
In a patient having dengue, most of the complications take place within two days of the fever coming down - as most people get careless when the fever is subsiding. After the fever has come down, if a patient reports giddiness, abdominal pain, or weakness, it should be attented to by a doctor. Complications resulting from dengue in this period can result in shift of blood volume - with the patient requiring fast infusion of oral or intravenous fluids.