diff --git a/lib/ui2/screens/health_screen.dart b/lib/ui2/screens/health_screen.dart
index 6221660a7..905680932 100644
--- a/lib/ui2/screens/health_screen.dart
+++ b/lib/ui2/screens/health_screen.dart
@@ -1026,8 +1026,11 @@ class _HealthScreenState extends State<HealthScreen> with RevisionReload {
       // Statistics off the STORED values; the painter gets the dense window.
       final s = valuesOf(pts);
       if (s.isEmpty) {
+        // Mid-sentence, like healthNoMetric: "No resting heart rate trend
+        // yet", not "No Resting…"; German keeps its noun case.
+        final noun = nounInSentence(l, label);
         return StatusCard(
-          l?.healthNoTrendYet(label) ?? 'No $label trend yet',
+          l?.healthNoTrendYet(noun) ?? 'No $noun trend yet',
           l?.healthZeroDaysStored ?? '0 days stored.',
           icon: LucideIcons.chartLine,
         );
diff --git a/lib/ui2/screens/investigate.dart b/lib/ui2/screens/investigate.dart
index e77c4ac53..fa314c32c 100644
--- a/lib/ui2/screens/investigate.dart
+++ b/lib/ui2/screens/investigate.dart
@@ -1094,10 +1094,12 @@ class _InvestigateState extends State<Investigate> {
       return [
         StatusCard(
           l?.investigateNoStoredSeries ?? 'No stored series',
+          // nounInSentence, not toLowerCase(): that read "hrv" in English
+          // and "Für ruhepuls" in German.
           l?.investigateNothingStoredYet(
-                uiText(context, spec.title).toLowerCase(),
+                nounInSentence(l, uiText(context, spec.title)),
               ) ??
-              'Nothing stored for ${uiText(context, spec.title).toLowerCase()} yet.',
+              'Nothing stored for ${nounInSentence(l, uiText(context, spec.title))} yet.',
           icon: spec.icon,
         ),
       ];
diff --git a/test/investigate_empty_series_case_test.dart b/test/investigate_empty_series_case_test.dart
new file mode 100644
index 000000000..5b7cb8fb7
--- /dev/null
+++ b/test/investigate_empty_series_case_test.dart
@@ -0,0 +1,46 @@
+// Investigate's "nothing stored yet" line put the metric name through a bare
+// toLowerCase(), so English read "Nothing stored for rem sleep yet." and German
+// "Für ruhepuls ist noch nichts gespeichert." It now goes through
+// nounInSentence, the same rule the Health rows and the metric detail use.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:openstrap_edge/data/day_label.dart';
+import 'package:openstrap_edge/l10n/app_localizations.dart';
+import 'package:openstrap_edge/ui2/screens/screens.dart';
+import 'package:openstrap_edge/ui2/ui2.dart';
+
+Future<void> _pump(WidgetTester t, String key, {Locale? locale}) async {
+  t.view.physicalSize = const Size(390 * 3, 3000 * 3);
+  t.view.devicePixelRatio = 3;
+  addTearDown(t.view.reset);
+  await t.pumpWidget(MaterialApp(
+    theme: buildTheme(Brightness.light),
+    locale: locale,
+    localizationsDelegates: AppLocalizations.localizationsDelegates,
+    supportedLocales: AppLocalizations.supportedLocales,
+    home: Investigate(key,
+        data: InvestigateData(day: todayLabel(), series: const [])),
+  ));
+  await t.pumpAndSettle();
+}
+
+void main() {
+  testWidgets('english lowercases a name but keeps an acronym', (t) async {
+    await _pump(t, 'resting_hr', locale: const Locale('en'));
+    expect(find.text('Nothing stored for resting heart rate yet.'),
+        findsOneWidget);
+
+    await _pump(t, 'rem', locale: const Locale('en'));
+    expect(find.text('Nothing stored for REM sleep yet.'), findsOneWidget);
+    expect(find.text('Nothing stored for rem sleep yet.'), findsNothing);
+  });
+
+  testWidgets('german keeps the noun case', (t) async {
+    await _pump(t, 'resting_hr', locale: const Locale('de'));
+    expect(find.text('Für Ruhepuls ist noch nichts gespeichert.'),
+        findsOneWidget);
+    expect(find.text('Für ruhepuls ist noch nichts gespeichert.'),
+        findsNothing);
+  });
+}
diff --git a/test/ui2_health_no_metric_case_test.dart b/test/ui2_health_no_metric_case_test.dart
index 2f75a85a1..928e57bc3 100644
--- a/test/ui2_health_no_metric_case_test.dart
+++ b/test/ui2_health_no_metric_case_test.dart
@@ -58,4 +58,34 @@ void main() {
     await _pump(t, const Locale('en'));
     expect(find.text('No resting heart rate'), findsOneWidget);
   });
+
+  // Same rule on the Trends tab's empty card. It used to drop the label in
+  // as written, so English read "No Resting heart rate trend yet".
+  Future<void> openTrends(WidgetTester t) async {
+    await t.tap(find.text('Trends'));
+    for (var i = 0; i < 20; i++) {
+      await t.pump();
+    }
+  }
+
+  testWidgets('english lowercases the trend card label', (t) async {
+    t.view.physicalSize = const Size(800 * 3, 4000 * 3);
+    t.view.devicePixelRatio = 3;
+    addTearDown(t.view.reset);
+    await _pump(t, const Locale('en'));
+    await openTrends(t);
+    expect(find.text('No resting heart rate trend yet'), findsOneWidget);
+    expect(find.text('No Resting heart rate trend yet'), findsNothing);
+    // An acronym keeps its case.
+    expect(find.text('No HRV trend yet'), findsOneWidget);
+  });
+
+  testWidgets('german keeps the noun case in the trend card', (t) async {
+    t.view.physicalSize = const Size(800 * 3, 4000 * 3);
+    t.view.devicePixelRatio = 3;
+    addTearDown(t.view.reset);
+    await _pump(t, const Locale('de'));
+    await openTrends(t);
+    expect(find.text('Noch kein Trend für Ruhepuls'), findsOneWidget);
+  });
 }