diff --git a/app/Services/UserDoctorService.php b/app/Services/UserDoctorService.php
index 2b12007..f5bc620 100644
--- a/app/Services/UserDoctorService.php
+++ b/app/Services/UserDoctorService.php
@@ -527,7 +527,7 @@ class UserDoctorService extends BaseService
 
             // 患病时长
             if (empty($order_inquiry_case['diagnosis_date'])) {
-                $data['diagnosis_date'] = "未知";
+                $data['diagnosis_date'] = "";
             } else {
                 $data['diagnosis_date'] = date('Y-m-d', strtotime($order_inquiry_case['diagnosis_date']));
             }