Which client history detail should be considered a contraindication for the use of oral contraceptives?

Frequent headaches with visual changes is a significant contraindication for the use of oral contraceptives because it may indicate underlying conditions such as migraines with aura or other vascular issues. Oral contraceptives can potentially exacerbate these types of headaches due to hormonal fluctuations and may increase the risk of stroke in susceptible individuals. Therefore, a client presenting with this symptom would require careful evaluation and potential alternative contraceptive options that do not carry the same risks.

In contrast, regular exercise practices, previous pregnancies without complications, and no history of smoking do not generally pose a health risk that would contraindicate the use of oral contraceptives. These factors are typically considered safe and do not have the same implications for vascular health or associated risks as headaches with visual changes.